### Here are some chess puzzles from the games of Didier Collas. 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)
Didier Collas vs Vincent Colin, Auxerre, 1996
5rk1/3qbpBp/r7/p2p4/8/5N2/PP3nPP/R2QR1K1 w - - 1 0
[ Rxe7 Qxe7 Bxf8 if Qe3 Qd4 or if Nxd1 Bxe7 ]

b)
White mates in 4.
Didier Collas vs Roland Weill, France, 1998
1r1qnbrk/pp2NR1p/2p2pp1/3p4/3P4/2P2Q1P/PPB2PP1/4R1K1 w - - 1 0
[ Qh5 if h6 Nxg6+ ]

c)
White mates in 3.
Didier Collas vs Philippe Blanvillain, Besancon, 1999
r1b5/pp3Qpk/4p3/2q1N1b1/3r2P1/4R3/PPP2P1P/R5K1 w - - 1 0
[ Rh3+ if Bh6 Rxh6+ ]

d)
Didier Collas vs Zbigniew Czajka, Cappelle la Grande, 1999
r3k2r/p3nppp/1p2p2n/1bqpP2P/5Q2/2BB1N2/1PP2PP1/R3K2R w KQ - 1 0
[ Bb4 Qc6 Nd4 ]

e)
Didier Collas vs Pablo Almagro Llanas, Lisbon, 2001
5r2/ppkn1B1p/2p2n2/6B1/8/5RP1/PP2K1P1/8 w - - 1 0
[ Bxf6 if Rxf7 Bd8+ ]

Didier Collas Puzzles, Part II.
The color disk on the diagram indicates who moves first.
a)
White mates in 5.
Didier Collas vs Mustapha Nezar, France, 2006
5rk1/2q4p/p1b1P3/1p3N1Q/3p4/6P1/P5P1/3R2K1 w - - 1 0
[ Qg4+ Kh8 Qxd4+ if Kg8 Nh6# ]

b)
Didier Collas vs Ivo Taskov, Bansko, 2010
r3kb1r/p1pq1ppp/1pn1pn2/3p1b2/Q1PP1B2/P3PN2/1P3PPP/RN2KB1R w KQkq - 1 0
[ cxd5 exd5 Bb5 ]

c)
Didier Collas vs Clement Frederic, Saint-Quentin, 2015
4rrk1/p7/6qp/1pp5/2bB1PpP/PR4P1/4Q1B1/4R2K w - - 1 0
[ Qxc4+ bxc4 Bd5+ if Re6 Rxe6 cxd4 Rxg6+ or if Qf7 Bxf7+ Kxf7 Rb7+ ]

d)
Black mates in 4.
Marc Lacrosse vs Didier Collas, Cappelle la Grande, 1991
4r1k1/5p1p/3Q2p1/3N2K1/6P1/5P1P/8/4q3 b - - 0 1
[ ...h6+ Kf4 g5+ Kf5 Qb1+ ]

e)
Black mates in 4.
Thierry Ziliotto vs Didier Collas, Guingamp, 1999
7r/3k2p1/p2bp1p1/B1Pb1p2/7N/1N2P2K/P3nPP1/R3R3 b - - 0 1
[ ...g5 c6+ Kc8 g3 Rxh4+ gxh4 g4# ]

Didier Collas Puzzles, Part III.
The color disk on the diagram indicates who moves first.
a)
Black mates in 2.
Alda Carvalho vs Didier Collas, Lisbon, 2001
1r4k1/p3ppbp/6p1/5b2/8/2qBB3/P1Q3PP/2KR3R b - - 0 1
[ ...Rb1+ ]

b)
Jose Aguinaga Ruiz vs Didier Collas, Pamplona, 2002
r7/1b1R3p/5k2/3p1N1P/1p3p2/1P2BP2/1K1Q4/5q2 b - - 0 1
[ ...Qa1+ Kc2 Ra2+ Kd3 Ba6# ]

c)
Black mates in 3.
Khalil Bengherabi vs Didier Collas, Beirut, 2003
2N5/1B6/R3pk2/4n3/6r1/P6K/1PP2b2/8 b - - 0 1
[ ...Rg3+ ]

d)
Black mates in 2.
Claudio Gonzalez vs Didier Collas, Saint-Affrique, 2005
2r5/3k1p1p/3ppPp1/8/r2bP1N1/1p3R2/1P2R2P/1K6 b - - 0 1
[ ...Ra1+ ]

e)
Stephane Boulet vs Didier Collas, Saint-Affrique, 2006
8/p4kp1/1p2pp2/7p/2P1P3/bPr5/P2R2PP/5NK1 b - - 0 1
[ ...Bc5+ if Kh1 Rc1 ]

f)
Black mates in 4.
Paul Velten vs Didier Collas, Caen, 2011
7r/p5k1/4ppp1/8/P1B1qPKP/1PQ3P1/8/8 b - - 0 1
[ ...Rxh4+ if gxh4 Qg2+ Qg3 f5+ or if Kxh4 Qh1+ ]

g)
Thomas Dionisi vs Didier Collas, Saint-Quentin, 2015
2k4r/2p3p1/5pn1/1RN3p1/2PbP1P1/3QB2P/2q2PK1/8 b - - 0 1
[ ...Nf4+ ]

French GMs

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