From the random game department

[sje]

[d]N1B4R/p7/2P5/P2N2k1/4R3/B1b5/b4QK1/R7 w - - 3 61
87 moves: (Ba6 Bb2 Bb4 Bb7 Bc1+ Bc5 Bd6 Bd7 Be6 Be7+ Bf5 Bf8 Bg4 Bh3 Kf1 Kf3 Kg1 Kg3 Kh1 Kh2 Kh3 Nab6 Nac7 Nb4 Ndb6 Ndc7 Ne3 Ne7 Nf4 Nf6 Nxc3 Qb2 Qb6 Qc2 Qc5 Qd2+ Qd4 Qe1 Qe2 Qe3+ Qf1 Qf3 Qf4+ Qf5# Qf6+ Qf7 Qf8 Qg1 Qg3# Qh4+ Qxa2 Qxa7 Ra4 Rae1 Rah1 Rb1 Rb4 Rc1 Rc4 Rd1 Rd4 Rd8 Re2 Re3 Re5+ Re6 Re7 Ree1 Ree8 Reh4 Rf1 Rf4 Rf8 Rg1 Rg4# Rg8+ Rh2 Rh3 Rh5+ Rh6 Rh7 Rhe8 Rhh1 Rhh4 Rxa2 a6 c7)

[sje]

[d]6r1/7k/1p4R1/3Q4/p3Q3/2Q4P/8/1NKb2BR w - - 1 78
90 moves: (Bc5 Bd4 Be3 Bf2 Bh2 Bxb6 Kb2 Kd2 Kxd1 Na3 Nd2 Qa1 Qa2 Qa3 Qa8 Qb2 Qb5 Qb7+ Qc7+ Qc8 Qca5 Qcb3 Qcb4 Qcc2 Qcc4 Qcc5 Qcc6 Qcd2 Qcd3 Qcd4 Qce1 Qce3 Qce5 Qcf3 Qd6 Qd7+ Qd8 Qda5 Qdb3 Qdc4 Qdc5 Qdc6 Qdd2 Qdd3 Qdd4 Qde5 Qde6 Qdf5 Qe2 Qe7+ Qe8 Qeb4 Qec2 Qec4 Qed3 Qed4 Qee1 Qee3 Qee5 Qee6 Qef3 Qef5 Qf4 Qf6 Qf7+ Qg2 Qg3 Qg4 Qg5 Qg7+ Qh4+ Qh5+ Qh8+ Qxa4 Qxd1 Qxg8# Rc6+ Rd6+ Re6+ Rf6+ Rg2+ Rg3+ Rg4+ Rg5+ Rg7+ Rh2 Rh6+ Rxb6+ Rxg8+ h4)

[sje]

[d]8/1k1n4/5Q2/7Q/P3N3/1P2Q3/6Rb/3KB3 w - - 1 80
95 moves: (Ba5 Bb4 Bc3 Bd2 Bf2 Bg3 Bh4 Kc1 Kc2 Kd2 Ke2 Nc3 Nc5+ Nd2 Nd6+ Nf2 Ng3 Ng5 Qa1 Qa5 Qa6+ Qa7+ Qb2 Qb5+ Qc1 Qc6+ Qd2 Qd3 Qd5+ Qd6 Qd8 Qe6 Qe7 Qe8 Qeb6+ Qec3 Qec5 Qed4 Qee2 Qef2 Qef3 Qef4 Qeg5 Qeh3 Qeh6 Qf1 Qf8 Qfb6+ Qfc3 Qfd4 Qfe5 Qff2 Qff3 Qff4 Qff5 Qff7 Qfg5 Qfg6 Qfh4 Qfh6 Qfh8 Qg1 Qg3 Qg4 Qg7 Qh7 Qhc5 Qhe2 Qhe5 Qhf3 Qhf5 Qhf7 Qhg5 Qhg6 Qhh3 Qhh4 Qhh6 Qhh8 Qxh2 Ra2 Rb2 Rc2 Rd2 Re2 Rf2 Rg1 Rg3 Rg4 Rg5 Rg6 Rg7 Rg8 Rxh2 a5 b4)

[sje]

[d]8/1k1n4/5Q2/7Q/P3N3/1P2Q3/6Rb/3KB3 w - - 1 80

Mate tests:

Code: Select all

> (sms-driver 1 "8/1k1n4/5Q2/7Q/P3N3/1P2Q3/6Rb/3KB3 w - - 1 80")
No mate located.
Node count: 96
#S(MAR :NODE-COUNT 96 :PV NIL :SUCCESS NIL)

> (sms-driver 2 "8/1k1n4/5Q2/7Q/P3N3/1P2Q3/6Rb/3KB3 w - - 1 80")
No mate located.
Node count: 8639
#S(MAR :NODE-COUNT 8639 :PV NIL :SUCCESS NIL)

> (sms-driver 3 "8/1k1n4/5Q2/7Q/P3N3/1P2Q3/6Rb/3KB3 w - - 1 80")
Mate in three found: 80. Qa6+ Kb8 81. Qaa7+ Kc8 82. Qe8#
Node count: 137945
#S(MAR :NODE-COUNT 137945 :PV (Qa6+ Kb8 Qaa7+ Kc8 Qe8#) :SUCCESS T)

[Ovyron]

somewhat systematically would probably get you 6000+ pretty easy.

-Sam

The longest possible game may not even reach 5900 moves:

http://rybkaforum.net/cgi-bin/rybkaforu ... 0#pid10760

[BubbaTough]

The longest possible game may not even reach 5900 moves:

You are relying pretty heavily on the word may I think. Given a significant cash incentive, I am quite sure I could create a game much larger than this. Given no cash incentive, I don't think its worth my time .

-San

[sje]

[d]4Q3/2Q5/8/5R2/3Q4/8/k7/5K1B w - - 19 185
96 moves: (Ba8 Bb7 Bc6 Bd5+ Be4 Bf3 Bg2 Ke1 Ke2 Kf2 Kg1 Kg2 Qa1+ Qa5+ Qa8+ Qb2+ Qb4 Qb5 Qb7 Qc1 Qc2+ Qca7+ Qcb6 Qcb8 Qcc3 Qcc4+ Qcc5 Qcc6 Qcc8 Qcd6 Qcd7 Qcd8 Qce5 Qce7 Qcf4 Qcf7+ Qcg7 Qd1 Qd2+ Qd3 Qd5+ Qda4+ Qda7+ Qdb6 Qdc3 Qdc4+ Qdc5 Qdd6 Qdd7 Qdd8 Qde3 Qde4 Qde5 Qdf4 Qdg7 Qdh8 Qe1 Qe2+ Qe6+ Qea4+ Qeb8 Qec6 Qec8 Qed7 Qed8 Qee3 Qee4 Qee5 Qee7 Qef7+ Qeh8 Qf2+ Qf6 Qf8 Qg1 Qg3 Qg4 Qg6 Qg8+ Qh2+ Qh4 Qh5 Qh7 Ra5+ Rb5 Rc5 Rd5 Re5 Rf2+ Rf3 Rf4 Rf6 Rf7 Rf8 Rg5 Rh5)

[Ovyron]

I could create a game much larger than this.

I think they key is that any move you can squeeze in there will equal at least 49 extra moves of the game

Anyway, this "longest game" problem doesn't seem very interesting, so I can live with Uri's answer as the longest game.

[sje]

Another couple of 100,000 game runs, this time with side-to-move data added:

Code: Select all

Total move count: 33564147

Game termination            White Black Total  Rate  
--------------------------- ----- ----- -----  ------
checkmate                    7728  7718 15446  0.1545
fifty moves draw             9949  9917 19866  0.1987
insufficient material draw  28060 27936 55996  0.5600
position repetition draw     1289  1204  2493  0.0249
stalemate                    3059  3140  6199  0.0620



Total move count: 33676037

Game termination            White Black Total  Rate  
--------------------------- ----- ----- -----  ------
checkmate                    7614  7511 15125  0.1513
fifty moves draw            10071 10042 20113  0.2011
insufficient material draw  27988 28072 56060  0.5606
position repetition draw     1314  1254  2568  0.0257
stalemate                    3128  3006  6134  0.0613

[sje]

From testing the cmucl version of the new CIL Toolkit, here is the summary report for a million random games:

Code: Select all

Total move count: 336233895

Game termination             White  Black  Total Rate  
---------------------------  -----  -----  ----- ------
checkmate                    76754  76485 153239 0.1532
fifty moves draw            100319 100279 200598 0.2006
insufficient material draw  279770 279595 559365 0.5594
position repetition draw     12745  12803  25548 0.0255
stalemate                    30793  30457  61250 0.0613