'Characteristic Puzzles in the Opening' series

Here are some chess puzzles from the games of Erling Mortensen. 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)
Erling Mortensen vs Kaj Rosell, Aarhus 1976
3R1nk1/r4ppp/2p5/p1r5/2N5/P6P/1P3PP1/3R2K1 w - - 1 0
[ Nb6 if g5 Nd7 or if Rc2 Nc8 or if Rc7 R1d7 ]

b)
Erling Mortensen vs Bjorn Brinck-Claussen, Horsens, 1978
3r4/pp1k4/3qp1b1/4p2r/3p4/5N2/PP1Q1PPP/R3R1K1 w - - 1 0
[ g4 if Rhh8 Nxe5+ ]

c)
Erling Mortensen vs Simen Agdestein, Gausdal, 1982
r1nq2k1/pp2n2p/2p3p1/4QrN1/3P1p2/1PN5/P4PPP/R3R1K1 w - - 1 0
[ Qe6+ if K any Qxf5(+) ]

d)
Erling Mortensen vs Dan Cramling, Gausdal, 1983
8/p5k1/3P4/3p2p1/3n4/4N3/P7/6K1 w - - 1 0
[ Nf5+ ]

e)
White mates in 3.
Erling Mortensen vs Timo Pirttimaki, Pohja, 1985
r6k/5q1B/p7/3pb2r/bp1Q3R/8/PPP4P/2K3R1 w - - 1 0
[ Qxe5+ Rxe5 Bf5+ ]

Erling Mortensen puzzles, pt. ii.
The color disk on the diagram indicates who moves first.
a)
White mates in 2.
Erling Mortensen vs Berge Ostenstad, Torshavn, 1987
5q1k/5Bpp/bp6/b2PN3/8/P3R3/1B3PPP/3n3K w - - 1 0
[ Ng6+ ]

b)
Erling Mortensen vs Bent Larsen, Aalborg, 1989
R2nk3/3p1p2/3P2r1/2r1p2p/7P/6R1/P3BP2/6K1 w - - 1 0
[ Rxg6 fxg6 Bd3 ]

c)
White mates in 5.
Erling Mortensen vs Heikki Westerinen, Espoo, 1989
6k1/p1p2b1p/4Qp2/1pp2p2/2PR1P2/7P/1q4PK/8 w - - 1 0
[ Rd8+ Kg7 Rd7 Kh6 Qxf7 ]

d)
White mates in 3.
Erling Mortensen vs Walter Browne, Reykjavik, 1990
2r2r1k/2R2ppp/1P1p4/3NpP2/1P2P3/1q6/p4QP1/K6R w - - 1 0
[ Rxh7+ ]

e)
White mates in 4.
Erling Mortensen vs Finn Pedersen, Herning, 1991
5R2/1r3p1k/8/n2pPpB1/8/1p6/4B1PP/6K1 w - - 1 0
[ Bf6 if b2 Rh8+ Kg6 Bh5# ]

See 3 moves ahead from wtharvey.com

Erling Mortensen puzzles, pt. iii.
The color disk on the diagram indicates who moves first.
a)
Erling Mortensen vs Kenneth Jorgensen, Copenhagen, 1992
4kb1r/2p1nppp/2q1b3/2p3B1/8/3R1Q2/PPP2PPP/4R1K1 w k - 1 0
[ Rd8+ Kxd8 Qxc6 ]

b)
Erling Mortensen vs Tiger Hillarp Persson, Copenhagen 1997
3r1r1k/8/1p1bR2P/p1p5/P1B2p2/8/1PP5/1K5R w - - 1 0
[ h7 if Rd7 Rg6 Rg7 Rxd6 or if Rf7 Rxd6 ]

c)
White mates in 2.
Erling Mortensen vs Goran Fant, Copenhagen, 2001
2bq3r/6k1/1p1Bp1p1/pPnpPpNP/P7/3B2Q1/2P2PP1/4K2R w K - 1 0
[ Nxe6+ ]

d)
Erling Mortensen vs Christian Christensen, Copenhagen, 2002
r1r3k1/1Q1b1pbp/p2q1np1/1p2p1B1/8/1BN5/PP3PPP/R4RK1 w - - 1 0
[ Bxf6 if Bxf6 Rad1 or if Rab8 Qd5 ]

e)
Erling Mortensen vs Richard Tozer, Copenhagen, 2002
6k1/5p1p/p2rp1pP/Pq6/2p2P2/3bQ1P1/2RR4/6K1 w - - 1 0
[ Rb2 if Qxa5 Rb8+ Rd8 Qe5 ]

f)
White mates in 3.
Erling Mortensen vs Oskar Von Bahr, Sweden, 2003
4r2k/1p3Q1p/p2p2p1/3P2P1/q2N4/8/r6P/2B2R1K w - - 1 0
[ Qf8+ ]

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