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Here are some chess puzzles from the games of Karl Ahues.
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)
Black mates in 3.
Rosenthal vs Karl Ahues, Hamburg, 1910
7r/ppq2pk1/2Pb1pp1/5b2/2Q5/1B1P1R2/PPP1N1Pr/5RK1 b - - 0 1
[ ...Bc5+ if Qxc5 Rxg2+ ]

b)
Lajos Asztalos vs Karl Ahues, Kecskemet, 1927
r3br1k/1pp4p/pnn1R1pN/5p2/1b1P1B2/8/PPBN1PPP/R5K1 b - - 0 1
[ ...Nd5 (if ...Nxd4 Be5+ mates) ]

c)
Dawid Przepiorka vs Karl Ahues, Kecskemet, 1927
3r3k/p4qpp/1p6/2P1Q1n1/2P2N2/6P1/PR3P1P/7K b - - 0 1
[ ...Rd1+ Kg2 Rg1+ ]

d)
Gerhard Weissgerber vs Karl Ahues, Bad Pyrmont, 1933
r2q1rk1/1p3ppp/2b5/8/p1P1n3/4R3/PPQ1BPPP/4K1NR b - - 0 1
[ ...Qa5+ if Rc3 Nxc3 w/Bxg2 or if Kd1 Nxf2+ ]

e)
Bjorn Nielsen vs Karl Ahues, Bad Niendorf, 1934
1r3rk1/2b3p1/ppp5/2p1n3/4PPbp/1PN1B1P1/P1P1N2K/3R1R2 b - - 0 1
[ ...Bxe2 if Nxe2 Ng4+ ]

Karl Ahues Puzzles, Part II.
The color disk on the diagram indicates who moves first.
a)
White mates in 4.
Karl Ahues vs Birger Rasmusson, Bad Niendorf, 1934
2r2rk1/1b3pp1/4p3/p3P1Q1/1pqP1R2/2P5/PP1B1K1P/R7 w - - 0 1
[ Qxg7+ Kxg7 Rg1+ ]

b)
White mates in 3.
Karl Ahues vs Gerhard Weissgerber, Germany, 1935
7R/5rp1/2p1r1k1/2q5/4pP1Q/4P3/5PK1/7R w - - 0 1
[ Rh6+ gxh6 Qxh6+ Kf5 Qg5# ]

c)
Karl Ahues vs Efim Bogoljubow, Bad Nauheim, 1936
1n4k1/5p1p/p2Pp1p1/P1Q2P2/1pr1q3/6B1/1P4PP/5RK1 w - - 0 1
[ Qc7 ]

d)
Moehler vs Karl Ahues, Bad Harzburg, 1946
3r1rk1/1pp3pp/p3b3/4n3/1P1Ppq2/P4P2/1Q1RB1PP/2R1N1K1 b - - 0 1
[ ...Ng4 if fxg4 Qf2+ mates
or if Bxa6 Qxh2+ Kf1 exf3
or if g3 Qe3+ Kh1 Nf2+ Kg2 Bh3+
]

Other German GMs
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