See 3 moves ahead from wtharvey.com
Here are some chess puzzles from the games of Ken Rogoff.
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) 
Ken Rogoff vs Mauri Sirkia, Haifa, 1970
3r1r2/ppn4p/5p2/3B1pk1/3R4/2P2P2/PP3K1P/R7 w - - 0 1
[ Rg1+ Kh5 Bf7+ ]
b) 
Ken Rogoff vs Kim Commons, Chicago, 1974
3r2k1/pq4pp/4p3/2br1p2/2N5/1PBnPQP1/3R1P1P/R5K1 w - - 0 1
[ Rxd3 ]
c) 
Ken Rogoff vs Erling Kristiansen, Polanica Zdroj, 1975
2b1rbk1/4qp1p/p2p1np1/1p6/4P3/1P1QN2P/PB1R1PP1/1B4K1 w - - 0 1
[ Qc3 if Qe5 Qc6 or if Bg7 Nd5 ]
d) 
White mates in 3.
Ken Rogoff vs Rosendo Balinas, Lone Pine, 1978
r4b1r/pp2kbp1/3R2B1/4P2p/2p2N1P/P4Pn1/1P1B2P1/R3K3 w - - 0 1
[ Nd5+ if Ke8 Nc7+ ]
1a) 
Ken Rogoff vs Mauri Sirkia
Puzzles by US GMs
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