## 'Characteristic Puzzles in the Opening' series

### Here are some chess puzzles from the games of Harmen Jonkman.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)
Harmen Jonkman vs Jan Boersma, Netherlands, 1992
r2k1r2/1pq3pp/3bQn2/1p4B1/8/8/PP4PP/4RR1K w - - 1 0
[ Rxf6 gxf6 Bxf6+ Be7 Bxe7+ Qxe7 Qxe7+ ]

b)
Harmen Jonkman vs Bernd Kohlweyer, Leeuwarden, 1993
1k5r/pp1rn1pp/4B1q1/n7/8/1Q2BP2/P4P1P/1RR4K w - - 1 0
[ Bxa7+ if Ka8 Qb6 or if Kxa7 Qb6+ ]

c)
White mates in 5.
Harmen Jonkman vs Gerard Donker,, Leiden, 1993
2kr1b1r/2p2ppp/p7/2qN4/5P2/5Q1P/PPP3P1/2KR3R w - - 1 0
[ Ne7+ Kb8 Rxd8+ Ka7 Nc8+ or if Bxe7 Qa8# ]

d)
White mates in 5.
Harmen Jonkman vs H Nacinovic, Helmond, 1993
3rr3/1p4kP/2q5/1R1p2BQ/2n1p3/3B4/5PP1/5RK1 w - - 1 0
[ Rxb7+ if Qxb7 Qh6+ or if Kh8 Qf7 ]

e)
White mates in 3.
Harmen Jonkman vs Holger Proehl, Dresden, 1994
Q1b4r/1p2kp2/4p1p1/1B1pP3/PP3P1N/4q3/6KP/2R5 w - - 1 0
[ Nxg6+ if fxg6 Rc7+ ]

1a)
Harmen Jonkman vs Jan Boersma

Harmen Jonkman puzzles, pt. ii.
The color disk on the diagram indicates who moves first.
a)
Harmen Jonkman vs Tullio Marinelli, Cannes, 1995
2r1kb1r/2q2pp1/p3p2p/3bP3/1Pp4B/PB6/5PPP/R1R2QK1 w k - 1 0
[ Ba4+ Bc6 Rxc4 if Qd7 Rxc6 Rxc6 Rc1 ]

b)
White mates in 7.
Harmen Jonkman vs Oliver Reeh, Wijk aan Zee, 1995
r4qk1/pb4pp/1p6/n1nP1BP1/3Q4/5N1P/PB3P2/4R1K1 w - - 1 0
[ Bxh7+ if Kh8 Qh4 Qf4 Bxg7+ Kxg7 Qh6+
or if Kxh7 Qh4+ Kg8 g6 Qf7 Qh7+
]

c)
Harmen Jonkman vs Evert Leeuwenburgh, Haarlem, 1996
3kr2Q/pp1b2r1/2n2qp1/3p1pN1/3P4/2PB2R1/PP3KP1/4R3 w - - 1 0
[ Rxe8+ Bxe8 Qxg7 Qxg7 Ne6+ ]

d)
Harmen Jonkman vs Elmar Doennebrink, Germany, 1997
1r2k2r/pp1n1ppp/4p3/5b1q/P2P2n1/1Q5P/1P1NBP1b/R1B1K2R w KQk - 1 0
[ Rxh2 if Qh4 Nf3 ]

e)
Harmen Jonkman vs Yochanan Afek, Wijk aan Zee, 1997
r3kb1r/1p1nnppp/pq2p3/3pP3/1P6/N1PQ1N2/P4PPP/R1BR2K1 w kq - 1 0
[ Nc4 if Qc7 Nd6+ or if Nxe5 Nxb6 ]

2c)
Harmen Jonkman vs Evert Leeuwenburgh

Harmen Jonkman puzzles, pt. iii.
The color disk on the diagram indicates who moves first.
a)
White mates in 5.
Harmen Jonkman vs Lutz Espig, Chemnitz, 1998
2q4r/r2b1p1k/p3pBpb/1p5R/3NB1P1/2P5/PP3P1P/3R2K1 w - - 1 0
[ Rxh6+ Kxh6 Rd3 ]

b)
White mates in 2.
Harmen Jonkman vs Wolfgang Uhlmann, Chemnitz, 1998
5Q2/8/4r2p/7p/6kP/5pP1/4qP2/2R3K1 w - - 1 0
[ Qf4+ ]

c)
White mates in 2.
Harmen Jonkman vs Dennis De Vreugt, Dieren, 1998
3q3k/pn1br1rN/5NpQ/1ppPp3/2P5/3P3p/PP5P/5R1K w - - 1 0
[ Nf8+ Rh7 Nxg6# ]

d)
Harmen Jonkman vs Mark Lyell, Copenhagen, 1999
3q1r1k/ppr1nppp/4b3/3p2B1/3P4/1BP3Q1/P1P3PP/4RRK1 w - - 1 0
[ Rxe6 if fxe6 Rxf8+ ]

e)
White mates in 4.
Harmen Jonkman vs Adalberto Villavicencio, Tenerife, 1999
r4b2/pp3Q1p/2p1p3/3k4/3B4/7P/qPP2PP1/2KR4 w - - 1 0
[ Bxa7+ if Ke5 f4+ Ke4 Re1+ or if Kc4 Rd4+ ]

f)
Harmen Jonkman vs Evert Baak, Soest, 2000
r1b2k1r/1p3ppp/4p3/p2n4/2B2q2/2P2N2/PP1Q1PPP/2KR3R w - - 1 0
[ Qxf4 if Nxf4 Rd8+ ]

g)
Harmen Jonkman vs Dennis De Vreugt, Amsterdam, 2001
r3r1kb/5p1p/1pp3pB/4P2P/p2P2n1/2P3N1/bqBQ2P1/R4RK1 w - - 1 0
[ Rxa2 Qxa2 Bxg6 if Qxd2 Bxf7# or if Nxh6 Qxa2 ]

3d)
Harmen Jonkman vs Mark Lyell

More Dutch GMs

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