Form990EZ
Department of the Treasury
Internal Revenue Service
Short Form
Return of Organization Exempt From Income Tax
Under section 501(c), 527, or 4947(a)(1) of the Internal Revenue Code (except private foundations)
Do not enter social security numbers on this form as it may be made public.


Go to www.IRS.gov/Form990EZ for instructions and the latest information.
OMB No. 1545-0047
2025
Open to Public
Inspection
A
For calendar year 2025, or tax year beginning 01 - 01 2025, and ending 12 - 31, 20 25
B
Check if applicable:
C Name of organization
AMERICAN CONTRACT BRIDGE LEAGUE UNIT 503
 
Number and street (or P. O. box, if mail is not delivered to street address)PO Box 391206
  Room/suite
City or town, state or province, country, and ZIP or foreign postal code Mountain View, CA94039
D Employer identification number

37-1565599
E Telephone number

(650) 269-2758
F Group Exemption
Number  
G Accounting Method: Other (specify) hybridH Check I Website:paloaltobridge.orgJ Tax-exempt status (check only one) - ( 4) (insert no.) or
K Form of organization:  
L Add lines 5b, 6c, and 7b to line 9 to determine gross receipts. If gross receipts are $200,000 or more, or if total assets (Part II, column (B) below) are $500,000 or more, file Form 990 instead of Form 990-EZ ........................... $ 174,464
Part Ⅰ
Revenue, Expenses, and Changes in Net Assets or Fund Balances (see the instructions for Part I) Check if the organization used Schedule O to respond to any question in this Part I.....................
VerticalRevenue 1 Contributions, gifts, grants, and similar amounts received .................... 1 8,744
2 Program service revenue including government fees and contracts ................ 2 151,847
3 Membership dues and assessments ............................. 3 5,773
4 Investment income .................................... 4 5,651
5a Gross amount from sale of assets other than inventory ....... 5a 0
b Less: cost or other basis and sales expenses ............ 5b 0
c Gain or (loss) from sale of assets other than inventory (Subtract line 5b from line 5a) ...... 5c 0
6 Gaming and fundraising events
a Gross income from gaming (attach Schedule G if greater than $15,000) 6a 0
b Gross income from fundraising events (not including $ 0 of contributions from fundraising events reported on line 1) (attach Schedule G if the sum of such gross income and contributions exceeds $15,000) ..6b 0
c Less: direct expenses from gaming and fundraising events ... 6c 0
d Net income or (loss) from gaming and fundraising events (add lines 6a and 6b and subtract line 6c) 6d 0
7a Gross sales of inventory, less returns and allowances ...... 7a 2,449
b Less: cost of goods sold ............. 7b 1,443
c Gross profit or (loss) from sales of inventory (Subtract line 7b from line 7a) ......... 7c 1,006
8 Other revenue (describe in Schedule O) .................... 8 0
9 Total revenue. Add lines 1, 2, 3, 4, 5c, 6d, 7c, and 8 .............. 9 173,021
VerticalExpenses 10 Grants and similar amounts paid (list in Schedule O) ................ 10 0
11 Benefits paid to or for members ...................... 11 0
12 Salaries, other compensation, and employee benefits ................ 12 0
13 Professional fees and other payments to independent contractors ............ 13 0
14 Occupancy, rent, utilities, and maintenance ................... 14 116,493
15 Printing, publications, postage, and shipping ................... 15 0
16 Other expenses (describe in Schedule O) ................... 16 60,221
17 Total expenses. Add lines 10 through 16 ................. 17 176,714
VerticalNetAssets 18 Excess or (deficit) for the year (Subtract line 17 from line 9) ............ 18 -3,693
19 Net assets or fund balances at beginning of year (from line 27, column (A)) (must agree with
end-of-year figure reported on prior year’s return) ................. 19 175,306
20 Other changes in net assets or fund balances (explain in Schedule O) ........... 20 0
21 Net assets or fund balances at end of year. Combine lines 18 through 20 .......... 21 171,613
For Paperwork Reduction Act Notice, see the separate instructions.
Cat. No. 10642I Form 990-EZ (2025)
Form 990-EZ (2025)
Page 2
Part ⅡBalance Sheets (see the instructions for Part II)Check if the organization used Schedule O to respond to any question in this Part II.................

(A) Beginning of year(B) End of year
22Cash, savings, and investments................
174,426
22
173,365
23Land and buildings....................
0
23
0
24Other assets (describe in Schedule O) ..........
24,353
24
23,181
25Total assets......................
198,779
25
196,546
26
Total liabilities (describe in Schedule O) .............
23,473
26
24,933
27Net assets or fund balances (line 27 of column (B) must agree with line 21)
175,306
27
171,613
Part ⅢStatement of Program Service Accomplishments (see the instructions for Part III) Check if the organization used Schedule O to respond to any question in this Part III . . Expenses
(Required for section 501(c)(3) and 501(c)(4) organizations; optional for others.)
What is the organization's primary exempt purpose? American Contract Bridge League Unit 503 is a bridge organization which promotes the play of duplicate bridge. It is comprised of 10 bridge clubs and is the largest ACBL Unit in the San Francisco Bay Area.
Describe the organization’s program service accomplishments for each of its three largest program services, as measured by expenses. In a clear and concise manner, describe the services provided, the number of persons benefited, and other relevant information for each program title.
28 The American Contract Bridge League Unit 503 is an organization which promotes the play of duplicate bridge. It is comprised of 10 bridge clubs and is the largest ACBL Unit in the San Francisco Bay Area. Recreational and educational opportunities are provided for Unit 503's approximately 800 bridge club members, other ACBL Bay Area Units' 5,300 members, as well as the general public, to learn and play the card game of bridge. During 2025 duplicate bridge games were held either face-to-face or online at multiple times each day, up to seven days a week. The Unit rents a facility in Mountain View, CA where face-to-face bridge games are played. In 2025 the bridge club held 12 two-to-five-day face-to-face bridge tournaments. Throughout the year face-to-face bridge lessons were held at the club. Additionally, the Unit held six Zoom bridge lectures, given by world-class bridge expert celebrities, and attended by as many as 150 students, as part of the club's bridge education program. The Unit has a mentor program and held three Pro/Am games in which experienced bridge players partner with less experienced players to improve their skills. A large library of bridge books is available for members' learning. The Unit's website is extensive and contains information about the Unit's activities, bridge game schedules and results of daily games, bridge lessons and learning opportunities, and the Unit's governance. The Unit's president publishes a monthly letter, which updates club members as to the club's activities and upcoming events. The Unit also contributes a column to the bridge District newsletter, published regularly and free to members, which contains club news, upcoming events, and bridge-related information of interest to club members. Silicon Valley Youth Bridge offers after-school bridge programs, bridge mentoring events, and other opportunities for youth to learn the game of bridge, all held at ACBL Unit 503's Bridge Center. These include weekly Casual Fridays, Pizza Party bridge tournaments, and Summer Camp bridge classes. The Unit membership and guests are largely seniors, and the Unit provides a social environment where members and the general public can meet new people, make friends, pursue a hobby, play an entertaining card game, and keep mentally sharp.
(Grants $ 0) If this amount includes foreign grants, check here ...		 28a 176,714
29
(Grants $   ) If this amount includes foreign grants, check here ... 		29a
30
(Grants $   ) If this amount includes foreign grants, check here ... 		30a
31 Other program services (describe in Schedule O) ................
(Grants $   ) If this amount includes foreign grants, check here...		 31a
32 Total program service expenses (add lines 28a through 31a).......... 32 176,714
Part Ⅳ
List of Officers, Directors, Trustees, and Key Employees (list each one even if not compensated ; see the instructions for Part IV)Check if the organization used Schedule O to respond to any question in this Part IV............
(a) Name and title (b) Average
hours per week
devoted to position		 (c) Reportable compensation
(Forms W-2/1099-MISC) (if not paid, enter -0-) 		(d) Health benefits, contributions to employee benefit plans, and
deferred compensation		 (e) Estimated amount
of other compensation
Liz Koh  
 
President 		3 0 0 0
Stephanie Youngquist  
 
Vice President 		3 0 0 0
Marc Cervellino  
 
Treasurer 		3 0 0 0
Dianne Giancarlo  
 
Secretary 		3 0 0 0
John Schwartz  
 
Board member 		3 0 0 0
Geraldine MacDonald  
 
Board member 		3 0 0 0
Dana Shelley  
 
Board member 		3 0 0 0
Dan Thatte  
 
Board member 		3 0 0 0
H Paul Davis  
 
Board member 		3 0 0 0
Alex Narasin  
 
Board member 		3 0 0 0
David Merenbach  
 
Board member 		3 9 0 0
Form 990-EZ (2025)
Form 990-EZ (2025)
Page 3
Part Ⅴ
Other Information
(Note the Schedule A and personal benefit contract statement requirements in the
instructions for Part V.) Check if the organization used Schedule O to respond to any question in this Part V.......
Yes
No
33
Did the organization engage in any significant activity not previously reported to the IRS? If "Yes," provide a detailed description of each activity in Schedule O ...................
33
 
No
34
Were any significant changes made to the organizing or governing documents? If "Yes," attach a conformed copy of the amended documents if they reflect a change to the organization’s name. Otherwise, explain the changeon Schedule O. See instructions. ..........................
34
Yes
 
35a
Did the organization have unrelated business gross income of $1,000 or more during the year from business activities (such as those reported on lines 2, 6a, and 7a, among others)? ............
35a
 
No
b
If "Yes," to line 35a, has the organization filed a Form 990-T for the year? If "No," provide an explanation in Schedule O
35b
 
 
c
Was the organization a section 501(c)(4), 501(c)(5), or 501(c)(6) organization subject to section 6033(e) notice, reporting, and proxy tax requirements during the year? If "Yes," complete Schedule C, Part III
35c
 
No
36
Did the organization undergo a liquidation, dissolution, termination, or significant disposition of net assets during the year? If “Yes," complete applicable parts of Schedule N ................
36
 
No
37a
Enter amount of political expenditures, direct or indirect, as described in the instructions.
37a
0
b
Did the organization file Form 1120-POL for this year?...................
37b
 
No
38a
Did the organization borrow from, or make any loans to, any officer, director, trustee, or key employee or were
any such loans made in a prior year and still outstanding at the end of the tax year covered by this return?..
38a
 
No
b
If “Yes," complete Schedule L, Part II and enter the total amount involved .
38b
 
39
Section 501(c)(7) organizations. Enter:
a
Initiation fees and capital contributions included on line 9.......
39a
 
b
Gross receipts, included on line 9, for public use of club facilities.....
39b
 
40a
Section 501(c)(3) organizations. Enter amount of tax imposed on the organization during the year under:
section 4911   ; section 4912   ; section 4955  
b
Section 501(c)(3), 501(c)(4), and 501(c)(29) organizations. Did the organization engage in any section 4958 excess benefit transaction during the year, or did it engage in an excess benefit transaction in a prior year that has not been reported on any of its prior Forms 990 or 990-EZ? If “Yes," complete Schedule L, Part I
40b
 
No
c
Section 501(c)(3), 501(c)(4), and 501(c)(29) organizations. Enter amount of tax imposed on organization managers or disqualified persons during the year under sections 4912, 4955, and 49580
d
Section 501(c)(3), 501(c)(4), and 501(c)(29) organizations. Enter amount of tax on line 40c reimbursed by the organization0
e
All organizations. At any time during the tax year, was the organization a party to a prohibited tax shelter transaction? If "Yes," complete Form 8886-T ................
40e
 
No
41List the states with which a copy of this return is filed. CA
42a The organization's books are in care of Marc Cervellino
 Telephone no. (650) 269-2758


Located at 2938 Waverley StreetPalo Alto, CA ZIP + 4 94306


Yes
No
b
At any time during the calendar year, did the organization have an interest in or a signature or other authority over a financial account in a foreign country (such as a bank account, securities account, or other financial account)? . .
42b
 
No
If “Yes," enter the name of the foreign country:
See the instructions for exceptions and filing requirements for FinCEN Form 114, Report of Foreign Bank and Financial Accounts (FBAR).
c
At any time during the calendar year, did the organization maintain an office outside the U.S.? . . .
42c
 
No
If “Yes," enter the name of the foreign country:
43 Section 4947(a)(1) nonexempt charitable trusts filing Form 990-EZ in lieu of Form 1041 - Check here ......
and enter the amount of tax-exempt interest received or accrued during the tax year .... 43
 
Yes
No
44a
Did the organization maintain any donor advised funds during the year? If "Yes," Form 990 must be completed insteadof Form 990-EZ.............................
44a
 
No
b
Did the organization operate one or more hospital facilities during the year? If "Yes," Form 990 must be completedinstead of Form 990-EZ.............................
44b
 
No
c
Did the organization receive any payments for indoor tanning services during the year? .........
44c
 
No
d
If "Yes," to line 44c, has the organization filed a Form 720 to report these payments? If "No," provide an
explanation in Schedule O ............................
44d
 
 
45a
Did the organization have a controlled entity within the meaning of section 512(b)(13)?.........
45a
 
No
45b
Did the organization receive any payment from or engage in any transaction with a controlled entity within the meaning of section 512(b)(13)? If "Yes," Form 990 and Schedule R may need to be completed instead of Form 990-EZ (see instructions)......................
45b
 
No
Form 990-EZ (2025)
Form 990-EZ (2025)
Page 4
Yes
No
46
Did the organization engage, directly or indirectly, in political campaign activities on behalf of or in opposition to candidates for public office? If “Yes," complete Schedule C, Part I. ...........
46
 
No
Part Ⅵ
Section 501(c)(3) Organizations Only All section 501(c)(3) organizations must answer questions 47- 49b and 52, and complete the tables for lines 50 and 51. Check if the organization used Schedule O to respond to any question in this Part VI ..................
Yes
No
47
Did the organization engage in lobbying activities or have a section 501(h) election in effect during the tax year? If "Yes," complete Schedule C, Part II .......................
47
 
 
48
Is the organization a school as described in section 170(b)(1)(A)(ii)? If "Yes," complete Schedule E ..
48
 
 
49a
Did the organization make any transfers to an exempt non-charitable related organization?......
49a
 
 
b
If "Yes," was the related organization a section 527 organization?................
49b
 
 
50
Complete this table for the organization's five highest compensated employees (other than officers, directors, trustees and key employees) who each received more than $100,000 of compensation from the organization. If there is none, enter "None."
(a) Name and title of each employee (b) Average
hours per week
devoted to position		 (c) Reportable compensation
(Forms W-2/1099-MISC) 		(d) Health benefits, contributions to employee benefit plans, and deferred compensation (e) Estimated amount of other compensation
 
f
Total number of other employees paid over $100,000 .............  

51
Complete this table for the organization's five highest compensated independent contractors who each received more than $100,000 of compensation from the organization. If there is none, enter "None."
(a) Name and business address of each independent contractor (b) Type of service (c) Compensation
 
d
Total number of other independent contractors each receiving over $100,000..........  


52
Did the organization complete Schedule A? NOTE. All section 501(c)(3) organizations must attach a
completed Schedule A ........................................
Under penalties of perjury, I declare that I have examined this return, including accompanying schedules and statements, and to the best of my knowledge and belief, it is true, correct, and complete. Declaration of preparer (other than officer) is based on all information of which preparer has any knowledge.
Sign Here
Signature of officer Date
Officer's name and title
Paid Preparer Use Only
Preparer's name
Preparer's signature
Date
PTIN
Firm's name

Firm's EIN
Firm's address



Phone no.
May the IRS discuss this return with the preparer shown above? See instructions .........
Form 990-EZ (2025)

Additional Data


Software ID: 25022730
Software Version: v1.00

Form 990-EZ, Special Condition Description:
Special Condition Description

Schedule B
(Form 990)
(Rev. January 2025)
Department of the Treasury
Internal Revenue Service
Schedule of Contributors

Attach to Form 990, 990-EZ, or 990-PF.
Go to www.irs.gov/Form990 for the latest information.
OMB No. 1545-0047
Name of the organization
AMERICAN CONTRACT BRIDGE LEAGUE UNIT 503
 
Employer identification number

37-1565599
Organization type (check one):
Filers of:
Section:
Form 990 or 990-EZ
501(c)( ) (enter number) organization

4947(a)(1) nonexempt charitable trust not treated as a private foundation

527 political organization


Form 990-PF
501(c)(3) exempt private foundation

4947(a)(1) nonexempt charitable trust treated as a private foundation

501(c)(3) taxable private foundation
Check if your organization is covered by the General Rule or a Special Rule.  
Note:  Only a section 501(c)(7), (8), or (10) organization can check boxes for both the General Rule and a Special Rule. See instructions.
General Rule
For an organization filing Form 990, 990-EZ, or 990-PF that received, during the year, contributions totaling $5,000 or more (in money or other property) from any one contributor. Complete Parts I and II. See instructions for determining a contributor's total contributions.
Special Rules
For an organization described in section 501(c)(3) filing Form 990 or 990-EZ that met the 331/3% support test of the regulations
under sections 509(a)(1) and 170(b)(1)(A)(vi), that checked Schedule A (Form 990 or 990-EZ), Part II, line 13, 16a, or 16b, and that received from any one contributor, during the year, total contributions of the greater of (1) $5,000 or (2) 2% of the amount on (i) Form 990, Part VIII, line 1h, or (ii) Form 990-EZ, line 1. Complete Parts I and II.
For an organization described in section 501(c)(7), (8), or (10) filing Form 990 or 990-EZ that received from any one contributor,
during the year, total contributions of more than $1,000 exclusively for religious, charitable, scientific, literary, or educational purposes, or for the prevention of cruelty to children or animals. Complete Parts I, II, and III.
For an organization described in section 501(c)(7), (8), or (10) filing Form 990 or 990-EZ that received from any one contributor,
during the year, contributions exclusively for religious, charitable, etc., purposes, but no such contributions totaled more than $1,000. If this box is checked, enter here the total contributions that were received during the year for an exclusively religious, charitable, etc., purpose. Don't complete any of the parts unless the General Rule applies to this organization because it received nonexclusively religious, charitable, etc., contributions totaling $5,000 or more during the year ......... $  
Caution: An organization that isn't covered by the General Rule and/or the Special Rules doesn't file Schedule B (Form 990,
990-EZ, or 990-PF), but it must answer “No” on Part IV, line 2, of its Form 990; or check the box on line H of its Form 990-EZ
or on its Form 990PF, Part I, line 2, to certify that it doesn't meet the filing requirements of Schedule B (Form 990,
990-EZ, or 990-PF).
For Paperwork Reduction Act Notice, see the Instructions
for Form 990, 990-EZ, or 990-PF.
Cat. No. 30613XSchedule B (Form 990) (Rev. 1-2025)
Schedule B (Form 990) (Rev. 2025) Page 2
Name of organization
AMERICAN CONTRACT BRIDGE LEAGUE UNIT 503
  		Employer identification number
37-1565599
Part I
Contributors (see instructions). Use duplicate copies of Part I if additional space is needed.
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
RESTRICTED
 
 
 
 
  ,    

$ RESTRICTED


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
Schedule B (Form 990) (Rev. 1-2025)
Schedule B (Form 990) (Rev. 1-2025)
Page 3
Name of organization
AMERICAN CONTRACT BRIDGE LEAGUE UNIT 503
  		Employer identification number

37-1565599
Part II
Noncash Property (see instructions). Use duplicate copies of Part II if additional space is needed.
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
Schedule B (Form 990) (Rev. 1-2025)
Schedule B (Form 990) (Rev. 1-2025)
Page 4
Name of organization
AMERICAN CONTRACT BRIDGE LEAGUE UNIT 503
  		Employer identification number

37-1565599
Part III
Exclusively religious, charitable, etc., contributions to organizations described in section 501(c) (7), (8), or (10) that total more than $1,000 for the year from any one contributor. Complete columns (a) through (e) and the following line entry. For organizations completing Part III, enter the total of exclusively religious, charitable, etc., contributions of $1,000 or less for the year. (Enter this information once. See instructions.) $  
Use duplicate copies of Part III if additional space is needed.
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
Schedule B (Form 990) (Rev. 1-2025)
Additional Data


Software ID: 25022730
Software Version: v1.00
SCHEDULE O
(Form 990)
(Rev. January 2025)
Department of the Treasury
Internal Revenue Service
Supplemental Information to Form 990 or 990-EZ

Complete to provide information for responses to specific questions on
Form 990 or 990-EZ or to provide any additional information.
Attach to Form 990 or 990-EZ.
 Go to www.irs.gov/Form990 for instructions and the latest information.
OMB No. 1545-0047
Open to Public
Inspection
Name of the organization
AMERICAN CONTRACT BRIDGE LEAGUE UNIT 503
 
Employer identification number

37-1565599
Return Reference Explanation
Form 990-EZ, Part I, Line 16 Description;Amount^Tournament expenses;34372|Celebrity bridge lectures;10117|Bridge supplies;9318|Software;1369|Promotional expense;1360|County health department fee;1107|Liability insurance;1181|Miscellaneous expenses;1397^Total;60221^
Form 990-EZ, Part II, Line 24 Description;EOY Amount^Security deposits;12000|Intangible asset leasehold improvement carpet;10469|Accounts receivable;712^Total;23181^
Form 990-EZ, Part II, Line 26 Description;EOY Amount^Unrecognized revenue PBEF grant carpet;10469|Other current liabilities;8865|Unrecognized revenue;3316|Accounts payable;2283^Total;24933^
Form 990-EZ, Part V, Line 34 1) Maximum number of Board members set at 12. 2) President can serve up to three consecutive years, which can be extended by a vote of the Board. 3) Organization's name changed to American Contract Bridge League Unit 503 from American Contract Bridge League Unit 503 Palo Alto Bridge Club reported on previous Form 990EZ and Palo Alto Unit 503 of the American Contract Bridge League in the previous Bylaws 4) No standing committees 5) Amendments to Bylaws may be made by the Board.
For Paperwork Reduction Act Notice, see the Instructions for Form 990 or 990-EZ.
Cat. No. 51056K
Schedule O (Form 990) (Rev. 1-2025)


Additional Data


Software ID: 25022730
Software Version: v1.00