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Here are some chess puzzles from the games of John Grefe.
The color disk on the diagram indicates who moves first.

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

a)
John Grefe vs Norman Weinstein, USA, 1974
5rk1/2r4p/1p1p1qp1/p1nP1P2/8/1P4RP/3Q2PK/1B3R2 w - - 0 1
[ fxg6 if Qxf1 gxh7+ Kf7 Qh6 Qxb1 Rf3+ mates ]

b)
Andrew Karklins vs John Grefe, Houston, 1974
8/p3qp1k/2p1n1pp/P3p3/2B1P2P/2P1QPP1/1r1R3K/8 b - - 0 1
[ ...Qc5 ]

c)
John Grefe vs Pal Benko, USA, 1975
1r1rbbk1/2q2p2/2npp1p1/1p3PPp/4P2Q/1nN1BB1R/1PP4P/R6K w - - 0 1
[ f6 if Ra8 Bxh5 mates ]

d)
Samuel Reshevsky vs John Grefe, USA, 1977
2kr4/p1p5/1p2p3/5p2/2P2P2/P4bP1/1P1N1q2/2KQ1R2 b - - 0 1
[ ...Rxd2 if Rf2 Rxd1+ ]

1a)
John Grefe vs Norman Weinstein

John Grefe puzzles, pt. ii.
The color disk on the diagram indicates who moves first.
a)
White mates in 6.
John Grefe vs Arnold Denker, Lone Pine, 1979
2b1kr2/p4p1Q/p1p1pR2/2Ppq3/7N/8/PrP3PP/5RK1 w - - 0 1
[ Rxf7 if Rh8 Rf8+ Rxf8 Rxf8+ Kxf8 Ng6+ ]

b)
White mates in 3.
John Grefe vs Nick De Firmian, Oakland, 1980
6rk/3P1Rnp/1q4p1/4Q3/2B5/6PP/1P6/7K w - - 1 0
[ Qxg7+ ]

c)
White mates in 5.
John Grefe vs Bill Heywood, New York, 1982
5rk1/6q1/p7/2pPp2Q/2p5/2P3b1/P7/2K3RR w - - 1 0
[ Rxg3 Rf1+ Rxf1 Qxg3 Qf7+ ]

d)
White mates in 6.
John Grefe vs Lubomir Ftacnik, San Francisco, 1991
8/1nr2q1k/p1Q1R1R1/5p1p/2p2P2/6P1/P6P/7K w - - 0 1
[ Rh6+ Kg8 Reg6+ Qxg6 Qxg6+ ]

2a)
mate in 6
John Grefe vs Arnold Denker

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