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Here are some chess puzzles from the games won by computers.
The color disk on the diagram indicates who moves first.

Solutions are between the brackets under each puzzle.
Drag your cursor from one bracket to the other.

a)
"Chaos" vs "Advance 3.0", USA, 1983
r4rk1/5pp1/P3pn1p/8/3q4/b1N2P2/1nBBQP1P/1R2R1K1 w - - 0 1
[ Nb5 Qc5 Nxa3 Qxa3 Bc1 ]

b)
White mates in 5.
"Belle Constellation" vs Stephen Gordon, Pasadena, 1983
8/pR5p/3Nkpp1/2p4q/2P3nb/1P4Q1/P3PnK1/2B2R2 w - - 0 1
[ Nc8+ if Bxg3 Re7+ Kf5 e4# ]

c)
"Mephisto Mega IV C" vs Jeroen Noomen, Dieren, 1988
3r2n1/3r1p1k/1p2q1pp/2pRB3/p1P1P3/P3Q1P1/1P5P/3R2K1 w - - 0 1
[ Bc7 if Rxd5 cxd5 ]

d)
White mates in 5.
"IBM Challenger 9" vs Alexei Suetin, Moscow, 1988
r4r2/3R3p/p3p3/2b2q1k/8/2p2PQ1/PP3P2/R5K1 w - - 0 1
[ Rxh7+ Qxh7 Kg2 ]

e)
"LChess" vs "Delta", Netherlands, 1988
r2q3r/pppk1ppp/2n2n2/3p4/1bPP2b1/3B1N2/PP1B1PPP/RN1QR1K1 w - - 0 1
[ Bxb4 if Nxb4 Qa4+ Nc6 cxd5 Nxd5 Ne5+ ]

1e)
"LChess" vs "Delta"

Computer puzzles, pt. ii.
The color disk on the diagram indicates who moves first.
a)
"Novag X" vs Vivek Rao, 1988
1r3r1k/p3p1bp/q2p1np1/1b6/4P1P1/1Q2BN2/PPP1B3/1K1R3R w - - 0 1
[ Nh4 ]

b)
White mates in 5.
"F/M Challenger X" vs "Dappet", Edmonton, 1989
3r3r/3nb1kp/5p1R/1p1RpQPB/p3P3/P3BK2/1q6/8 w - - 0 1
[ gxf6+ if Bxf6 Rxd7+ or if Nxf6 Rg6+ ]

c)
"Zarkov" vs "Chess", Edmonton, 1989
r1b2rk1/pp2bppp/4pn2/2p3N1/3q4/6P1/PPQBPPBP/R4RK1 w - - 0 1
[ Bc3 Qd8 Bxf6 ]

d)
White mates in 4.
"Deep Thought" vs Eric Cooke, New York, 1989
1q2r3/1b3kpp/1p6/p5Q1/Pn1r4/5P2/1P4PP/2R1R1K1 w - - 0 1
[ Rc7+ if Qxc7 Qf5+ ]

e)
"Mephisto Almeria" vs Eric Chapa, New York, 1989
8/8/5p2/4k1pp/p1P4P/P3K1P1/8/8 w - - 0 1
[ g4 if hxg4 h5 ]

2d)
mate in 4
"Deep Thought" vs Eric Cooke

Computer puzzles, pt. iii.
The color disk on the diagram indicates who moves first.
a)
Black mates in 4.
"Blitz" vs "Belle", 1975
r1b2k2/ppppq1p1/6p1/2b5/2Bnn3/2N5/PPPP1PPK/R1BQ1R2 b - - 0 1
[ ...Qh4+ Kg1 Ng3 ]

b)
Black mates in 3.
"Bs6676" vs "Elsa", Toronto, 1977
r5k1/pR6/2p2pp1/8/2b2P2/2Pr3P/P3KP2/7R b - - 0 1
[ ...Re8+ if Kf1 Rg3# ]

c)
Black mates in 3.
"Albatross" vs "Gambiet 80", London, 1980
2r1k2r/pp3ppp/2n1p3/8/1b1qP1Q1/1P6/4KPPP/5BNR b k - 0 1
[ ...Ne5 ]

d)
Black mates in 4.
"CS Challenger X" vs "Awit", Linz, 1980
3r2k1/4p2p/2p3pB/1p2P3/3nQ3/2q5/r5PP/2R2KR1 b - - 0 1
[ ...Rf8+ Bxf8 Qxc1+ Qe1 Qf4+ ]

e)
Black mates in 2.
"Fidelity X" vs "Philidor X", Travemunde, 1981
3rk2N/pp3ppp/8/q1b5/8/2nb1PP1/P2K3P/R1Q4R b - - 0 1
[ ...Ne4+ Kd1 Nf2# ]

3d)
mate in 4
"CS Challenger X" vs "Awit"

Computer puzzles, pt. iv.
The color disk on the diagram indicates who moves first.
a)
Black mates in 4.
"65 Cyrus X" vs "Constellation", Budapest, 1983
2k4r/pp3ppp/8/4Bb2/1b4P1/2p1n3/PP1rPN1P/R1K2B1R b - - 0 1
[ ...Rc2+ Kb1 Rxe2+ gxf5 Re1+ ]

b)
Black mates in 2.
"Chess-Master" vs "Gedeon X", Budapest, 1983
6k1/p4ppp/2p1r3/2b2q2/R7/PP1P1P2/1P5P/R1B1NK2 b - - 0 1
[ ...Qh3+ ]

c)
"Chessnut 3" vs "Sargon 3", Glasgow, 1984
r1bq1rk1/pp1p1ppp/2n2n2/2b1p3/2P1P3/N2Q4/PP1N1PPP/R1B1KB1R b KQ - 0 1
[ ...Ng4 w/Bxf2+ or Nxf2 ]

d)
"Turbostar 440" vs "Princhess 6", Amsterdam, 1985
r2qk2r/1p1bbppp/p1n5/4p3/Q3P3/N1P1B3/P4PPP/2R1KB1R b Kkq - 0 1
[ ...Na5 ]

e)
Black mates in 3.
Dirk Schiefelbusch vs "Leonardo Maestro", Cologne, 1986
6k1/1pR5/p4qp1/1b1p4/8/7Q/4rPPP/5RK1 b - - 0 1
[ ...Qxf2+ ]

4a)
mate in 4
"65 Cyrus X" vs "Constellation"

Computer puzzles, pt. v.
The color disk on the diagram indicates who moves first.
a)
"Cyrus B" vs "Mephisto 1", Dallas, 1986
r1br2k1/4bppp/2q1pn2/p7/2BN1B2/3Q4/PP3PPP/1R3RK1 b - - 0 1
[ ...Rxd4 Qxd4 Bb7 f3 Bc5 ]

b)
M Roggeveen vs "Mephisto Mega IV C", Dieren, 1988
6k1/pp3p2/5Pnp/2p4Q/3pq1P1/2P3K1/P4R2/8 b - - 0 1
[ ...Qe3+ Kg2 Nf4+ ]

c)
Black mates in 3.
Gyorgy Bajusz vs "Mephisto Almeria", Budapest, 1989
6k1/pp5p/2p3p1/3p4/1q2r3/1P2b1P1/P5P1/1Q2RK2 b - - 0 1
[ ...Qf8+ ]

d)
Black mates in 3.
"Much" vs "Hitech", Edmonton, 1989
r3k3/1pp2p2/p1n1q3/3p3r/3P2p1/1P2b1P1/PBQ1R1K1/R4B2 b q - 0 1
[ ...Rh2+ Kxh2 Qh6+ ]

e)
Black mates in 3.
"Nightmare (D)" vs "Rebel", Portoro, 1989
1r3bk1/p5pr/8/4pb2/6nP/2P2P2/P7/2KRR3 b - - 0 1
[ ...Ba3+ Kd2 Rb2+ ]

5a)
"Cyrus B" vs "Mephisto 1"


Computers of 1990-94; 1995-99

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