Here are some chess puzzles from the games of Ulf Andersson.
White to move and win.

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


a)
Ulf Andersson vs H Akvist, Sweden, 1969
r1q2r1k/4Q1pp/p2pb3/3p3B/8/2P5/P4PPP/1R1R2K1 w - - 0 1
[ Rb7 w/Re1 & Bf7 ]

b)
Ulf Andersson vs O Alfredsson, Sweden, 1969
5rk1/1p1r1pbp/pB1p1np1/4p3/Pq2P3/1PN1QP2/1P4PP/3RR2K w - - 0 1
[ Na2 ]

c)
Ulf Andersson vs B Horberg, Sweden, 1969
8/pp3ppp/2k2p2/2N3r1/2PP4/6Pn/P1P2P2/3R1K2 w - - 0 1
[ d5+ if Kxc5 d6 ]

d)
Ulf Andersson vs Kenneth Rogoff, Olot, 1971
3r1rnk/1b2qp1p/p5p1/1pn1p3/4P1QN/P1NB3R/1PP3PP/5R1K w - - 0 1
[ Rxf7 w/Nxg6+ ]

e)
Ulf Andersson vs E Jelling, EU Cup, 1994
8/1p2q2Q/2bk1p2/b2p1B2/3P1N2/4P3/5PK1/8 w - - 0 1
[ Qh2 ]



Ulf Andersson Puzzles, Part II.
The color disk on the diagram indicates who moves first.
a)
White mates in 3.
Ulf Andersson vs Jouko Lahti, Raach, 1969
r2b1R2/ppr4k/3q2p1/6pN/3P2Q1/1P6/P5PP/5RK1 w - - 1 0
[ Nf6+ if Bxf6 Qh3+ or if Kg7 Ne8+ ]

b)
White mates in 3.
Ulf Andersson vs Zbigniew Doda, Lodz, 1969
5k1r/p2bpp2/3p4/2q2PN1/1p1p4/3P1B2/1PP3Qn/6RK w - - 1 0
[ Nh7+ Ke8 Qg8+ ]

c)
White mates in 3.
Ulf Andersson vs Lawrence Day, Wijk aan Zee, 1970
R2rk1r1/3n1p2/2QP1p1b/4p1Pp/7P/2P1BN2/1q3P2/5RK1 w - - 1 0
[ Rxd8+ Kxd8 Qc7+ ]

d)
Ulf Andersson vs Theo Van Scheltinga, Wijk aan Zee, 1970
b1r4k/5pp1/7p/3pQ3/4B3/1p2qP1N/1P4PP/R6K w - - 1 0
[ Qc7 ]

e)
Ulf Andersson vs Jan Smejkal, Amsterdam, 1973
R7/1pp3bk/4q1pp/1Pp4n/2Qp1P2/2NP2P1/5PBK/4r3 w - - 1 0
[ Bd5 Qe7 Bg8+ Kh8 Bh7+ if Qe8 Rxe8+ Rxe8 Bxg6 ]

Ulf Andersson Puzzles, Part III.
The color disk on the diagram indicates who moves first.
a)
White mates in 4.
Ulf Andersson vs Vernlund, Sweden, 1975
3r1rk1/ppq1nppp/2p5/5b2/2B5/2Q3N1/PPP2PPP/3R1RK1 w - - 1 0
[ Nh5 ]

b)
White mates in 4.
Ulf Andersson vs Jan-Hein Donner, Amsterdam, 1979
8/p2nq2p/1p1N1pk1/3Q3p/1P2pP2/P5P1/5P2/6K1 w - - 1 0
[ Qg8+ Qg7 Qe8+ ]

c)
White mates in 3.
Ulf Andersson vs Ian Rogers, Malta, 1980
6rk/3R2rp/8/4Qp2/p1B2P2/1P4P1/6KP/2q5 w - - 1 0
[ Qxg7+ Rxg7 Rd8+ ]

d)
White mates in 3.
Ulf Andersson vs Roberto Cifuentes Parada, Salonika, 1984
2r1n1k1/3RR2p/p5pB/1p2N3/8/6PP/P1q2PK1/8 w - - 1 0
[ Rxe8+ Rxe8 Rg7+ ]

e)
White mates in 5.
Ulf Andersson vs Anders Backlund, Denmark, 1992
6k1/p2b1r1p/5p1B/q2P3P/Pn1p4/1Q6/4KPP1/5B2 w - - 1 0
[ Qg3+ Kh8 Qb8+ ]

Ulf Andersson Puzzles, Part IV.
The color disk on the diagram indicates who moves first.
a)
Ulf Andersson vs Anatoly Karpov, Enkoping, 1995
r2q1rk1/1b2bppp/p3pn2/1p4B1/1n1P4/1BN2N2/PP2QPPP/3RR1K1 w - - 1 0
[ d5 if Nfd5 Nxd5 Bxg5 or if h6 dxe6 Qc7 exf7+ ]

b)
Ulf Andersson vs Friso Nijboer, Ter Apel, 1996
5rk1/8/p4qpQ/1p6/2n1R3/2P5/6BP/7K w - - 1 0
[ Rf4 if Qxf4 Bd5+ Qf7 Qxg6+ or if Qe7 Bd5+ ]

c)
Ulf Andersson vs Ramon Spitzer Isbert, Sanxenxo, 2003
r3r3/1pp3kp/2bpnpp1/p2B4/2PP4/PPN3P1/5P1P/1R1R2K1 w - - 1 0
[ Bxe6 ]

d)
Ulf Andersson vs Bart Von Meijenfeldt, Utrecht, 2013
2r5/4p2R/p4k2/1p4p1/3p1rP1/1P3PK1/P7/7R w - - 1 0
[ R1h6+ Ke5 Rxe7+ Kd5 Rg7 ]

e)
Jan Smejkal vs Ulf Andersson, Prague, 1970
4rrk1/1p1n2np/p2p4/2pP4/P1P3P1/2P4Q/2q3B1/2B1RRK1 b - - 0 1
[ ...Rxe1 Rxe1 Qf2+ ]

Ulf Andersson Puzzles, Part V.
The color disk on the diagram indicates who moves first.
a)
Fernando Visier Segovia vs Ulf Andersson, Las Palmas, 1972
3rr1k1/1Rp2ppb/2n4p/8/p3p1P1/4Q2P/PPq1PPB1/1N2R1K1 b - - 0 1
[ Rd1 ]

b)
Joaquin Diaz vs Ulf Andersson, Cienfuegos, 1975
b1r5/5k1p/p2p1np1/Np3p2/1P3P2/P2P2P1/2r1N2P/2R1R1K1 b - - 0 1
[ ...Rxe2 ]

c)
Jesus Hernandez vs Ulf Andersson, Cienfuegos, 1975
2rrn1k1/1q2bppp/pp2N3/2p1n1P1/8/1QN1BP2/PP1RP2P/3R2K1 b - - 0 1
[ ...Rxd2 ]

d)
Guillermo Estevez vs Ulf Andersson, Cienfuegos, 1977
2r5/1b3pk1/pqrpp1p1/4P1N1/1p2Pn1P/3B4/PPPQ4/1NKR2R1 b - - 0 1
[ ...Nxd3+ Qxd3 Qe3+ ]

e)
Black mates in 3.
Aleksander Wojtkiewicz vs Ulf Andersson, Haninge, 1990
5r2/2k5/1p1p3p/pPpPpr2/P1P1N3/4RbPp/3R1P2/6K1 b - - 0 1
[ ...h2+ ]

Ulf Andersson Puzzles, Part VI.
The color disk on the diagram indicates who moves first.
a)
Black mates in 3.
Dragoljub Velimirovic vs Ulf Andersson, Bar, 1997
8/kb3p2/1bq1p3/4P3/2N2P2/1p4Q1/1P2B3/1K6 b - - 0 1
[ ...Qh1+ ]

b)
Jonathan Dourerassou vs Ulf Andersson, Zuerich, 2009
3rr3/5pkp/pp2pnp1/8/2PN4/1P4P1/P2R1PP1/1R4K1 b - - 0 1
[ ...Ne4 if Rd3 e5 or if R2/d1 Nc3 ]

c)
Christian Srienz vs Ulf Andersson, Bad Wiessee, 2011
6k1/4pp1p/3p2p1/8/2PQ3P/1P4P1/r3qP2/R5K1 b - - 0 1
[ ...e5 ]

d)
Alex Vuilleumier vs Ulf Andersson, Geneva, 2012
1r4k1/p2n1pp1/2b1p2p/2p5/2P5/P2RPNP1/4BP1P/6K1 b - - 0 1
[ ...Bxf3 if Bxf3 Ne5 ]

e)
Johannes Engel vs Ulf Andersson, Bad Wiessee, 2016
2r1n1k1/1bq2pp1/p3p2p/4n3/1P1R1Q2/2N2N1P/1P3PP1/1B4K1 b - - 0 1
[ ...Nxf3+ gxf3 e5 ]

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