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Here are some chess puzzles from the games of Sergey Fedorchuk. 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)
Fedorchuk vs Cedric Paci, Duisburg, 1992
3q1rk1/p1r1n1b1/1p2bn1p/1PPp1pp1/1B1Pp3/Q3P1P1/3NNPBP/1RR3K1 w - - 1 0
[ cxb6 ]

b)
White Mates in 4.
Fedorchuk vs Sergiy Kovalov, Kiev, 1997
1r5k/4p1b1/q3BnPp/2pPB2Q/1pb5/6P1/P6P/R4RK1 w - - 1 0
[ Rxf6 if Be2 Qxh6+ or if exf6 Bxf6 ]

c)
Fedorchuk vs Rainer Buhmann, Oropesa, 1999
1r1r1kn1/1pq2pp1/p1n4p/2Np4/P7/2P1QPP1/1P2RPK1/1B2R3 w - - 1 0
[ Qf4 if Qc8 Ne6+ or if Qxf4 Re8+ ]

d)
White Mates in 6.
Fedorchuk vs Yakov Meister, Alushta, 2001
4rrk1/q4p2/p4Bp1/1p1p1P1p/1P5Q/3Pb2R/P5PP/5R1K w - - 1 0
[ Qxh5 gxh5 Rxh5 ]

e)
White Mates in 5.
Fedorchuk vs Yakov Meister, Alushta 2001
5rk1/q4p1p/p3rBp1/1p1p1P2/1P3Q2/3PR3/P5PP/4R2K w - - 1 0
[ Qh6 if Rxf6 Re8 ]

Fedorchuk Puzzles, Part II. The color disk on the diagram indicates who moves first.
a)
Fedorchuk vs Nikola Spiridonov, Sautron, 2002
3r1bk1/pp1n2p1/2p1RnQB/7P/3q4/8/PP3PP1/4R1K1 w - - 1 0
[ Bxg7 Bxg7 h6 if Ng4 (or Qg4) Re8+ ]

b)
White Mates in 4.
Fedorchuk vs Nikola Mitkov, Frankfurt, 2004
5rk1/1p3ppp/1bpQ1n2/p1nN4/q7/8/BPPB1PPP/4R1K1 w - - 1 0
[ Nxf6+ gxf6 Qxf8+ ]

c)
Fedorchuk vs Peter Petran, Warsaw, 2005
r3r1k1/1b1nqpbp/p5p1/P3p3/RpB1n3/1Q2BNNP/5PP1/4R1K1 w - - 1 0
[ Nxe4 Bxe4 Ng5 ]

d)
Fedorchuk vs Dobrev Nanko, Villenueve Tolosane, 2006
5rk1/r4ppp/p2Qnq2/8/P2n2P1/1p2B2P/1P3P2/1BR1R1K1 w - - 1 0
[ Bxd4 if Nxd4 Qxf8+ Kxf8 Rc8+ ]

e)
Fedorchuk vs Saleh Jasim, Dubai, 2006
2b2rk1/3n2pp/p3pp2/1rb5/1pNB1P2/2P3P1/PP4BP/2KRR3 w - - 1 0
[ Bc6 if Rb8 Bxd7 ]

Fedorchuk Puzzles, Part III. The color disk on the diagram indicates who moves first.
a)
Fedorchuk vs Erwan Menager, Avoine, 2006
r3r3/7p/5qpk/p1BQpb2/7P/8/PPP5/1K2R2R w - - 1 0
[ Qb7 if Qg7 Be3+ or if a4 Be3+ Kh5 Qf3+ Bg4 Qxf6 ]

b)
Fedorchuk vs Jose Reves Balleste, Tarragona, 2006
r4rk1/p2n1ppp/2pbbp2/1p5q/2PP4/3B4/PPQBNPPP/2K1R2R w - - 1 0
[ Ng3 if Qh4 Re4 ]

c)
Fedorchuk vs Christophe Bernard, Paris, 2008
4r1k1/1br1q1p1/p5Pp/1p1pPB2/2nN4/8/PPP4Q/1K1R3R w - - 1 0
[ Be6+ Kh8 Bf7 if Rf8 Qxh6+ mates ]

d)
White Mates in 5.
Fedorchuk vs Fabien Guilleux, Paris, 2008
r1b4r/3Rbk1p/pq2pp1Q/2p1pP2/Bp2P3/8/PPP3PP/2K1R3 w - - 1 0
[ Rxe7+ Kxe7 Qg7+ ]

e)
Fedorchuk vs Virgilio Vuelban, Porto San Giorgio, 2008
3r1k2/1pr3bQ/p6p/q7/5P2/2NB4/PPP4P/2K3R1 w - - 1 0
[ Bc4 if Ke8 Qg8+ mates ]

Continuing series from wtharvey.com

Fedorchuk Puzzles, Part IV. The color disk on the diagram indicates who moves first.
a)
White Mates in 4.
Fedorchuk vs Nad-Titus Petre, Aix les Bains, 2011
4nrk1/1bqrbp1p/p2pp1p1/1p6/3BPP2/P1NB1R1Q/1PP3PP/R6K w - - 1 0
[ Qxh7+ ]

b)
Fedorchuk vs Christian Bauer, Belfort, 2012
1k1r4/1pprbp2/1q2p1p1/pP3n1p/P2P4/B1PR2PP/4QPB1/3R3K w - - 1 0
[ Bc5 Bxc5 dxc5 ]

c)
White Mates in 4.
Fedorchuk vs Chanda Sandipan, Fujairah City, 2012
2r3k1/6pr/p1q3Q1/1p1pB3/4n1R1/P7/1PP2P2/1K1R4 w - - 1 0
[ Qxh7+ Kxh7 Rxg7+ ]

d)
Fedorchuk vs Sebastian Almagro Mazariegos, Navalmoral de la Mata, 2012
rn1qk2r/3n1ppp/p2bp3/1p6/3N2P1/2N4P/PPP2Pb1/R1BQR1K1 w kq - 1 0
[ Nxe6 fxe6 Qxd6 if Bf3 Qxe6+ Kf8 Bf4 ]

e)
White Mates in 4.
Fedorchuk vs Robert Straver, Leiden, 2013
2r1r1k1/1pqbbpPp/p3p3/3p2B1/P5Q1/2PB1NP1/1P3P2/R5K1 w - - 1 0
[ Bxh7+ if Kxh7 g8/Q+ or if Kxg7 Bf6+ ]

f)
Sergey Fedorchuk vs Jacek Szwed, Legnica, 5/6/2013
3r4/k2N2pp/pnq1pp2/8/3Q4/7P/P4PP1/5RK1 w - - 1 0
[ Ne5 if Qd5 Nc6+ ]

Fedorchuk Puzzles, Part V.
The color disk on the diagram indicates who moves first.
a)
Sergey Fedorchuk vs Davorin Kuljasevic, Legnica, 5/15/2013
4r1k1/r4p1p/p1np1Pp1/1p5q/1P1pPR1N/P2p2Q1/1P1B2PP/6K1 w - - 1 0
[ Nf3 if Ne5 Rf5 Nxf3+ gxf3 ]

b)
Sergey Fedorchuk vs Bragi Thorfinnsson, Reykjavik, 10/5/2013
4kr2/5p2/3r1Q2/2q1pP2/pp2b3/8/PPP1B1PP/1K1R4 w - - 1 0
[ Bb5+ ]

c)
White mates in 3.
Sergey Fedorchuk vs Alon Greenfeld, Bastia, 10/21/2013
2r2b1k/Q6p/1n6/4p3/1q2Np2/1PN4P/PK3P2/6R1 w - - 1 0
[ Rg8+ Kxg8 Nf6+ ]

d)
Lauren Van Niekerk vs Sergey Fedorchuk, Port Elizabeth, 7/6/2013
r2q1rk1/4bppp/4b3/3pP3/1npP1Q2/2B2N2/4BPPP/R1R3K1 b - - 0 1
[ ...Na2 if Rc2 Nxc3 Rxa8 Nxe2+ ]

e)
Nicolas Grandadam vs Sergey Fedorchuk, Zug, 8/27/2013
3r2k1/r4p1p/3P2p1/2p2q2/1pNb4/1P4P1/R3QP1P/4R1K1 b - - 0 1
[ ...Qxf2+ if Qxf2 Rxa2 ]

See 2, 3 or 4 moves ahead - books from the wtharvey.com library

Fedorchuk Puzzles, Part VI.
The color disk on the diagram indicates who moves first.
a)
Sigurbjorn Bjornsson vs Sergey Fedorchuk, Reykjavik, 10/6/2013
2rqk2r/1b2bp2/p2p1n2/1p2pPBp/3N4/P1NP3Q/1P3RPP/4R1K1 b k - 0 1
[ ...Ng4 if Bxe7 Nxf2 Qh4 Qxe7 ]

b)
White mates in 4.
Sergey Fedorchuk vs Ivan Ivanisevic, Paris, 2014
3bq1r1/1p1r1pp1/p3b1k1/3N1Rp1/P2QP3/2B4R/1P4PP/7K w - - 1 0
[ Qd1 if Rh8 Nf4+ gxf4 Qg4+ ]

c)
Sergey Fedorchuk vs Sebastien Pucher, Vlissingen, 2014
2rr1b2/5pkp/1pq5/p2NPp2/P7/1Q5P/1P1R2P1/3R3K w - - 1 0
[ Nf6 if Rxd2 Qg3+ mates ]

d)
White mates in 4.
Sergey Fedorchuk vs Jonathan Dourerassou, Bastia, 2014
1r3r1k/7p/qb1P2p1/1p6/2p1BQ2/2P4P/1P3P2/6RK w - - 1 0
[ Qe5+ Kg8 Bxg6 if Rf6 Bf7+ ]

e)
Evgeny Postny vs Sergey Fedorchuk, Montpellier, 6/3/2015
4rbk1/5p1p/q5pP/2p1P3/1n1pQ3/5NP1/4RPK1/3R4 b - - 0 1
[ ...f5 ]

Fedorchuk Puzzles, Part VII.
The color disk on the diagram indicates who moves first.
a)
Black mates in 3.
Wesley So vs Sergey Fedorchuk, Montpellier, 2015
2n3rr/bpNP1k2/p4pb1/3P4/1P6/P1N2n2/1B3PB1/R3RK2 b - - 0 1
[ ...Bd3+ Re2 Rh1+ ]

b)
Erik Oosterom vs Sergey Fedorchuk, Leiden, 2017
8/p1rq2pk/3p1n1p/1P2pRnP/4P1PK/P2PP3/3Q4/2R5 b - - 0 1
[ ...Nf3+ ]

c)
Sergey Fedorchuk vs Erik Blomqvist, Minsk, 2017
8/P3p1k1/8/4Np2/1P5p/7P/r5PK/8 w - - 1 0
[ 1.Nc6 if 1...e5 2.Na5 or if 1...Ra6 2.b5 ]

d)
Sergey Fedorchuk vs Grzegorz Gajewski, Katowice, 2017
5k2/2R4p/p4P1r/8/4N3/4P1K1/r7/8 w - - 1 0
[ 1.Ng5 if 1...Rxf6 2.Nxh7+ ]

e)
Black mates in 4.
Vojtech Zwardon vs Sergey Fedorchuk, Katowice, 2017
6k1/1Q3pp1/1p1p1q1p/1P3n2/3PB3/6PP/r4r2/3R1RK1 b - - 0 1
[ 1...Rxf1+ if 2.Kxf1 Nxg3+ or if 2.Rxf1 Qxd4+ ]

f)
Black mates in 5.
Matvey Galchenko vs Sergey Fedorchuk, Llucmajor, 2018
7k/1p2r1p1/pPq4p/7R/1P1Nn2P/P5p1/1B3r2/3Q2K1 b - - 0 1
[ 1...Ng5 2.Rxh6+ Qxh6 3.Qd2 Nh3+ 4.Kh1 Re1+ ]

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