'Chess Opening' series from wtharvey.com
Here are some chess puzzles from the Queen's Gambit Declined (ECO D35).

1.d4 d5 2.c4 e6 3.Nc3 Nf6
Solutions are between the brackets under each puzzle.
Drag your cursor from one bracket to the other.
White to move and win except where noted.
a) 
White mates in 6.
Fred Benima vs Wilhelm Kunze, Barmen, 1905
r1bqrnk1/pp2bppn/2p5/3pN1P1/3P4/2N1P3/PP3PP1/1BRQK2R w - - 0 1
[ Bxh7+ Nxh7 Qh5 Bf5 Qxf7+ ]
b) 
White mates in 5.
Foldesy vs Gyorgy Negyesy, Budapest, 1928
r1bqkb1r/pp1n1ppp/8/3N2N1/3Pp3/1Q6/PP3PPP/R1B1K2R w - - 0 1
[ Nc7+ if Ke7 or Qxc7 Qxf7+ ]
c) 
Hector Corral vs Jose Thiago Mangini, San Rafael, 1951
2kr1n1r/pp3pp1/2pbbn1p/3p4/3P3B/2NBqP2/PPQ1N1PP/1K2R2R w - - 0 1
[ Nd1 ]
d) 
Ludwig Engels vs K Heilbrunn, Sao Paulo, 1963
r1b2rk1/pp2qpp1/2p1n2p/3pN2n/3P4/2NBP3/PPQ2PPP/2R2RK1 w - - 0 1
[ Bh7+ Kh8 Bg6 if Nf6 Bxf7 ]
e) 
Mikhail Tal vs Petr Kiriakov, Riga, 1965
r2qr1k1/pp2bp2/4bnpp/3p4/3P3B/2NQ4/PPB2PPP/R3R1K1 w - - 0 1
[ Rxe6 if fxe6 Qxg6+ Kf8 Qxh6+ Kg8 Bg6+ ]
f) 
White mates in 3.
Fran Sanchez Alvarez vs Carlos Gutierrez Canseco, Asturias, 1989
rn4k1/pp1r1pp1/1q1b4/5QN1/5N2/4P3/PP3PPP/3R1RK1 w - - 0 1
[ Qh7+ Kf8 Qh8+ Ke7 Nd5# ]
1f) 
mate in 3
Fran Sanchez Alvarez vs Carlos Gutierrez Canseco
D35 Puzzles, Part II.
Black to move and win except where noted.
a) 
S Castellon vs Ilse Guggenberger, Buenos Aires, 1978
r1bqkb1r/pppn1ppp/5n2/3N2B1/3P4/8/PP2PPPP/R2QKBNR b KQkq - 0 1
[ ...Nxd5 if Bxd8 Bb4+ ]
b) 
Igor Stohl vs Srdjan Cvetkovic, Stary Smokovec, 1983
r2q1rk1/pp3pp1/1bn1b2p/1N1pN3/4nB2/4P3/PP2BPPP/2RQ1RK1 b - - 0 1
[ ...g5 if Nxc6 bxc6 or if Bg3 Nxg3 ]
c) 
Ferenc Hegedus vs Thomas Gruber, Dortmund, 1990
2r1k2r/1p1b1ppp/4p3/p1b5/2nNP3/2P2P2/P1B3PP/B2RK2R b - - 0 1
[ ...Ne3 if Rd2 Bxd4 ]
d) 
Gabriel Cabrera vs Jose Bernal Caamano, Spain, 1990
r1bqn1k1/pp3pp1/7p/3p1N2/3P1n2/2NBQP2/PP4PP/5RK1 b - - 0 1
[ ...Bxf5 if Bxf5 Qg5 ]
e) 
Black mates in 5.
Cesar Del Prado vs Francisco Caraballo Campos, Granada, 1991
r1b3k1/pp4pp/2Pq3r/3pPpn1/8/2NBP3/P1Q2PPP/1R3RK1 b - - 0 1
[ ...Nf3+ gxf3 Qg6+ ]
2c) 
Ferenc Hegedus vs Thomas Gruber
D35 Puzzles, Part III.
White to move and win.
a) 
Juan Corral Blanco vs Acebal Antonio, Asturias, 1986
r3k2r/pp2Bppp/2pP2n1/q2p4/3N4/2N1P3/PP2BP1P/2KR3R w - - 0 1
[ Nb3 if Qb4 Rd4 Qb6 Na4 or if Qb6 Na4 ]
b) 
Ludek Pachman vs Khalid Al-Awadhi, Baden-Baden, 1987
r1bqr1k1/3nbpp1/2p2n1p/1p1p4/p2P4/2NBP1B1/PPQ1NPPP/1R3RK1 w - - 0 1
[ Nxb5 if cxb5 Bc7 ]
c) 
Luc Winants vs Henk van Maaren, Netherlands, 1987
r3r1k1/pp4pn/2pq1pQ1/3pNb2/3P1Pn1/2N1P3/PP4PP/4RRK1 w - - 0 1
[ Qf7+ Kh8 Qxe8+ Rxe8 Nf7+ ]
d) 
Helmut Bliss vs Thomas Hantel, corr., 1988
rnbq1rk1/ppp1bppp/8/3p2B1/3Pn3/2NBP3/PP3PPP/R2QK1NR w - - 0 1
[ Bxe7 if Nxc3 Bxh7+ or if Qxe7 Nxd5 ]
e) 
Vladimir Litvinov vs Aloyzas Kveinys, Minsk, 1988
r2q1rk1/1p2bp1p/p1pn1np1/2NpN3/1P1P4/3QP1B1/P4PPP/1RR3K1 w - - 0 1
[ Nxb7 Nxb7 Nxc6 Qd7 Nxe7+ Qxe7 Rc7 ]
3e) 
Vladimir Litvinov vs Aloyzas Kveinys
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