Here are some chess puzzles from the games won by computers (1995-1999).
White to move and win except where noted.

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

a)
"Chess System Tal" vs "Junior", Paderborn, 1995
1r4k1/pbq2p1p/4pb1B/2p5/2B1PP2/2P5/P5P1/2RQ1K2 w - - 0 1
[ e5 ]

b)
"Hiarcs X" vs "Cheiron", Paderborn, 1995
r5k1/1n5p/p4Rp1/1p1q4/2pB2b1/2P5/P1B1r1PP/1R3QK1 w - - 0 1
[ Bxg6 ]

c)
"Chess Genius X" vs Nico Kuijf, Hague, 1995
1r3rk1/1b3ppp/pp1q1n2/2pBb1B1/4P3/P4N1P/1P3PP1/R1Q1R1K1 w - - 0 1
[ Nxe5 if Qxe5 Bf4 ]

d)
White Mates in 7. "Chess System Tal" vs Henny Maliangkay, Hague, 1995
1Q6/3p1p1r/p4k2/q2b1P1r/Pp1pP1Rp/8/1PP3PP/3R3K w - - 0 1
[ e5+ Kxf5 Rf1+ Bf3 Rxf3+ Kxg4 Qg8+ ]

e)
"Chessica" vs Erich Karstan, Hague, 1995
1br2rk1/p5p1/6p1/2p2pn1/2Pp1qP1/1P1P1N2/P1R2PB1/3QRK2 w - - 0 1
[ Nxg5 Qxg5 Bd5+ if Kh7 Kg2 w/Rh1 ]

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2,817 Checkmates !

Computers Puzzles, Part II. White to move and win except where noted.
a)
White Mates in 7. "Chessmaster 4000" vs Anne Benschop, Hague, 1995
2b2rk1/pp2Q1p1/2p4p/5pqB/2P5/1P6/P4PPP/4R1K1 w - - 0 1
[ Qxf8+ ]

b)
"Gandalf" vs Wim Van Der Pol, Hague, 1995
r1bq1r1k/pp4bp/1np2pp1/4p3/3PPNn1/1BP1B3/PP1N2PP/R3QRK1 w - - 0 1
[ Nxg6+ hxg6 Qh4+ Nh6 Bxh6 if Bd7 Be3+ mates ]

c)
"Isichess" vs Bert Kieboom, Hague, 1995
6k1/p1r1q2p/1p2Pbp1/3Q4/4P3/4p2P/P3B1P1/5RK1 w - - 0 1
[ Rxf6 if Qxf6 e7+ Kg7 e8/N+ ]

d)
White Mates in 5. "The King" vs "Dappet", Netherlands, 1995
2b2r2/p1Q2pkp/1p2p1p1/bq1PN3/4BP2/6P1/1B5P/R5K1 w - - 0 1
[ Nxf7+ if Qxb2 Ng5+ ]

e)
White Mates in 6. "Socrates" vs Willem Wolthuis, Hague, 1995
7R/ppkr1r2/2p1bp2/6p1/2PP1p2/Q4P2/PP3KP1/8 w - - 0 1
[ c5 w/Qa5+ ]



Computers Puzzles, Part III. White to move and win except where noted.
a)
"Deep Blue" vs "Cheiron", Hong Kong, 1995
1r3r1k/pqpb1ppp/2pp1n2/3P4/5N1Q/1P2PP2/P1PN3P/R3K1R1 w - - 0 1
[ Rxg7 if Kxg7 Qg4+ mates or if Rg8 Rxf7 Rg1+ Kf2 mates ]

b)
"Fritz 3" vs Rene Borngaesser, Katowice, 1995
3b4/8/2k3pn/p1n1Pp1p/2P2P2/1P1NKN1P/P7/8 w - - 0 1
[ Nd4+ Kb6 Nxc5 Kxc5 Ne6+ ]

c)
"Junior" vs Ilia Smirin, Nir-Galim, 1995
2rr1k2/1b3p1p/4p3/1B2b1N1/3p2R1/6PP/1PP5/1K1R4 w - - 0 1
[ Rf1 ]

d)
"Ant" vs "Morphy 1.3", Netherlands, 1995
2b1kb1r/1pB1pppp/r1n5/p7/4q3/8/PPPQNPPP/R3KB1R w KQk - 0 1
[ 0-0-0 if e6 Nc3 ]

e)
"Goldbar 95" vs "Schaakmeester 3X", Netherlands, 1995
r3k2r/pppqbppp/2n5/3p1b2/3P4/2PB1N2/P1P2PPP/R1BQR1K1 w kq - 0 1
[ Ne5 Nxe5 Bxf5 Qxf5 Rxe5 w/Ba3 ]

Computer Puzzles, Part IV. White to move and win.
a)
"Kallisto" vs "Bionic", Netherlands, 1995
r3k1nr/pp3ppp/2n1p3/2P5/5B1P/6P1/PqPQB1P1/3RK2R w Kkq - 0 1
[ Qd7+ Kf8 Bd6 if Nge7 Bxe7+ Nxe7 Qd8+ mates ]

b)
"Schach 3" vs "Ant", Netherlands, 1995
rn2kb1r/1pp1q2p/p5p1/4Np2/2QPp3/8/PPP2PPP/R1B2RK1 w kq - 0 1
[ Bg5 if b5 Qb3 Qxg5 Qf7+ w/Qd5+ ]

c)
"Doctor X" vs Bert Kieboom, Hague, 1996
1qr1nrk1/1b2R1bp/2p1P1p1/pp4p1/8/PBN5/1PP1QPPP/4R1K1 w - - 0 1
[ Rxb7 Qxb7 e7+ Kh8 exf8/Q+ Bxf8 Qe6 ]

d)
"Doctor X" vs Peter Van Wermeskerken, Hague, 1996
1rrq4/kp1n1pn1/p2p3p/2pPp1pP/4P1P1/2NR4/PPPQBP2/1K1R4 w - - 0 1
[ Nb5+ if axb5 Ra3+ mates or if Ka8 Nxd6 w/Nxf7 ]

e)
"NOW" vs Henk De Kleynen, Hague, 1996
3rk1nr/p3bppp/1p2p3/1N2n1B1/8/P4N2/1P3PPP/2R2RK1 w k - 0 1
[ Nc7+ if Kf8 Bxe7+ or if Kd7 Nxe5+ ]

Computer Puzzles, Part V. White to move and win except where noted.
a)
"MacChess" vs "Bionic", Netherlands, 1996
r3qrk1/1p2bppp/p7/4p3/1B2N1n1/1QR1P3/PP3PPP/3R2K1 w - - 0 1
[ Nd6 Qb8 Nxf7 if Bxb4 Nh6+ mates or if Rxf7 Rd7 ]

b)
"The King" vs "Rajah", Netherlands, 1996
r1b2rk1/pp2Q1pp/8/3N1p2/2pRn3/5N2/PqP3PP/4R1K1 w - - 0 1
[ Nc7 if Rb8 Ne8 Rf7 Qe5 Ra8 Nf6+ w/Rd8+ & Qxb2 ]

c)
"Isichess 2.6" vs Friso Nijboer, Hague, 1997
2k3r1/3p4/p3p3/5p2/8/5RPp/PnP1N2P/6K1 w - - 0 1
[ Rc3+ ]

d)
"Tasc R40" vs Jeroen Blokhuis, Hague, 1997
2r1rbk1/5p1p/p1n1pPp1/1p2P3/1P1N4/P6Q/qB1R2PP/4R1K1 w - - 0 1
[ Nb3 ]

e)
"Virtual Chess" vs Loewenthal/Wiarda, Hague, 1997
2rq2k1/pb3pp1/1p1b1n1p/1N1pNQ2/Pn1P4/6P1/1P1B1P1P/4R1K1 w - - 0 1
[ Nxf7 if Kxf7 Qe6+ Kg6 Nxd6 ]

Computer Puzzles, Part VI. White to move and win except where noted.
a)
White Mates in 5. "LChess" vs "ZZZZZZ", Netherlands, 1997
4R3/qpp2rkp/p1nr1pp1/P7/1P1p3N/2P2Q2/5PPP/R5K1 w - - 0 1
[ Nf5+ ]

b)
"MChess 7 0" vs Tom O'Donnell, Ottawa, 1997
r3r1k1/3R1ppp/pqp3n1/1pN5/8/2Q5/PPP2PPP/4R1K1 w - - 0 1
[ Ne6 ]

c)
"Dark Thought" vs "Techno Chess", Paris, 1997
r3r1k1/bpp2q1p/p1p1b1p1/6R1/PP6/2BB4/2P1QPPP/5RK1 w - - 0 1
[ Bxg6 if hxg6 Qh5 ]

d)
"Hydra" vs "Dragon", Paris, 1997
2r1rk2/pp1nppb1/2bp2p1/3N2Bp/2PqP3/1P5B/P2QRPPP/5RK1 w - - 0 1
[ Qc2 if Bxd5 Bxd7 or if Red8 Rd2 Qc5 b4 ]

e)
White Mates in 4. "Hydra" vs "XXXX II", Paris, 1997
r1b3R1/pp3Q2/3k4/3pN3/3p4/1q1P4/3RKPP1/8 w - - 0 1
[ Qf8+ Kxe5 Qe7+ ]

Computer Puzzles, Part VII. White to move and win.
a)
"Fritz 5" vs "Schredder 1 0 P75", Debrecen, 1998
2r2r1k/5p1p/3Rbp2/ppq1p3/4P2Q/2P3P1/3R1PBP/6K1 w - - 0 1
[ Rxe6 if fxe6 Rd7 mates ]

b)
"Fritz 5" vs Tamas Borsavolgyi, Debrecen, 1998
2rn4/1pN2pkp/6pn/8/p1b5/5N1P/PPB2PP1/3R2K1 w - - 0 1
[ Ne8+ Kf8 Nd6 ]

c)
"Junior 5.0" vs Peter Horvath, Debrecen, 1998
r1bq1rk1/pp2ppbp/2np2p1/8/2PNP1n1/2N1B3/PP2BPPP/R2Q1RK1 w - - 0 1
[ Bxg4 if Bxg4 Nxc6 ]


Computers of The 80s; 1990-94

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