MESON Chess Problem Database
Problem Display
PID: 72047 (4b3/n2R1p2/3ppN2/2p1kPPp/2pN1qPn/2P1p3/1Q5B/6KB w - - 0 1)
Karlstrom, Alfred Olaf
The Chess Problem, 1947
#2
11 + 12
SOLUTION
- SOUND
- Sets
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sg2
- 2.Sf3#
- 1...Sf3+
- 2.Sxf3#
- 1...Sxf5
- 2.Sf3#
- 1...Sg6
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...e2
- 2.Qxe2#
- 1...cxd4
- 2.cxd4#
- 1...hxg4
- 2.Sxg4#
- 1...d5
- 2.Qb8#
- 1...exf5
- 2.Re7#
- 1...Qxh2+
- Tries
- 1.Bg2?
- 1...Sf3+
- 2.Sxf3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sxg2
- 2.Sf3#
- 1...Sxf5
- 2.Sf3#
- 1...cxd4
- 2.cxd4#
- 1...hxg4
- 2.Sxg4#
- 1...exf5
- 2.Re7#
- 1...Qg3
- 2.Bxg3#
- 1...Sg6
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...e2
- 2.Qxe2#
- 1...d5
- 2.Qb8#
- 1...Qxh2+!
- 1...Sf3+
- 1.Bb7?
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sxf5
- 2.Sf3#
- 1...cxd4
- 2.cxd4#
- 1...hxg4
- 2.Sxg4#
- 1...exf5
- 2.Re7#
- 1...Sg2
- 2.Sf3#
- 1...Sg6
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...e2
- 2.Qxe2#
- 1...d5!
- 1...Qxh2+
- 1.Bg3?
- 1...Sf3+
- 2.Sxf3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sxf5
- 2.Sf3#
- 1...cxd4
- 2.cxd4#
- 1...hxg4
- 2.Sxg4#
- 1...exf5
- 2.Re7#
- 1...Sg2
- 2.Sf3#
- 1...Sg6
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...e2
- 2.Qxe2#
- 1...d5
- 2.Qb8#
- 1...Qxg3+!
- 1...Sf3+
- 1.Qb1?
- threat
- 2.Qe4#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...exf5
- 2.Re7#
- 1...d5
- 2.Qb8#
- 1...Qxh2+!
- threat
- 1.Qc2?
- threat
- 2.Qe4#
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...exf5
- 2.Re7#
- 1...d5!
- threat
- 1.Qd2?
- threat
- 2.Qxe3#
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Sxf5
- 2.Sf3#
- 1...cxd4
- 2.Qxd4#
- 2.cxd4#
- 1...Sg2
- 2.Sf3#
- 1...e2
- 2.Bxf4#
- 2.Qe3#
- 2.Qxf4#
- 2.Qxe2#
- 1...exd2!
- threat
- 1.Qe2?
- threat
- 2.Qxe3#
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Sxf5
- 2.Sf3#
- 1...Sg2
- 2.Sf3#
- 1...cxd4!
- threat
- 1.Qf2?
- threat
- 2.Bxf4#
- 2.Qxe3#
- 2.Qxf4#
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 2.Qxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Sxf5
- 2.Sf3#
- 2.Bxf4#
- 2.Qxf4#
- 1...cxd4
- 2.Bxf4#
- 2.Qxf4#
- 1...Sg2
- 2.Sf3#
- 1...Sg6
- 2.Sf3#
- 2.Qxe3#
- 1...e2
- 2.Bxf4#
- 2.Qe3#
- 2.Qxe2#
- 2.Qxf4#
- 1...exf2+!
- threat
- 1.Qg2?
- threat
- 2.Qe4#
- 1...Qxh2+
- 2.Qxh2#
- 1...Sf3+
- 2.Sxf3#
- 1...Sxg2
- 2.Sf3#
- 1...exf5
- 2.Re7#
- 2.Qd5#
- 1...Qg3
- 2.Bxg3#
- 2.Qxg3#
- 1...d5!
- threat
- 1.Qb6?
- threat
- 2.Qxd6#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sxf5
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...d5
- 2.Qc7#
- 2.Qd6#
- 2.Qb8#
- 1...Qxh2+!
- threat
- 1.Qb7?
- threat
- 2.Qe4#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...exf5
- 2.Re7#
- 2.Qd5#
- 1...Sc6
- 2.Sxc6#
- 1...d5
- 2.Qc7#
- 2.Qb8#
- 1...Qxh2+!
- threat
- 1.Qb8?
- threat
- 2.Qxd6#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sxf5
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc8
- 2.Sc6#
- 1...Qxh2+!
- threat
- 1.Bg2?
- Keys
- 1.Ba8!
- 1...Qxh2+
- 2.Qxh2#
- 1...Qg3+
- 2.Bxg3#
- 1...Sf3+
- 2.Sxf3#
- 1...Bxd7
- 2.Sxd7#
- 1...Sxf5
- 2.Sf3#
- 1...cxd4
- 2.cxd4#
- 1...hxg4
- 2.Sxg4#
- 1...exf5
- 2.Re7#
- 1...Sg2
- 2.Sf3#
- 1...Sg6
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...e2
- 2.Qxe2#
- 1...d5
- 2.Qb8#
- 1...Qxh2+
- 1.Ba8!
FEATURES
- Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD::S(F)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- S(d);N_GUARD,XP(H)::S(F)
- S(j);N_GUARD::S(F)
- S(j);N_GUARD::S(F),XS(j)
- P(a);OGATEB::QAR(C),XP(a)
- P(e);OGATE,XS(F)::P(E),XP(e)
- P(g);XP(G)::S(J),XP(g)
- P(h);OGATEB::QAB(C)
- P(i);OGATEB,XP(H)::R(K)
- Tries
- Try
- B(B);
- Vars
- S(d);CHECK,N_GUARD::S(F),XS(d)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD,XB(B)::S(F)
- S(d);N_GUARD,XP(H)::S(F)
- P(e);OGATE,XS(F)::P(E),XP(e)
- P(g);XP(G)::S(J),XP(g)
- P(i);OGATEB,XP(H)::R(K)
- Q(c);OGATEB,P_PINB(B)::B(D),XQ(c)
- S(d);N_GUARD::S(F)
- S(j);N_GUARD::S(F)
- S(j);N_GUARD::S(F),XS(j)
- P(a);OGATEB::QAR(C),XP(a)
- P(h);OGATEB::QAB(C)
- Refutation
- Q(c);CHECK,N_SPINQ(c),XB(D)
- Try
- B(B);
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD,XP(H)::S(F)
- P(e);OGATE,XS(F)::P(E),XP(e)
- P(g);XP(G)::S(J),XP(g)
- P(i);OGATEB,XP(H)::R(K)
- S(d);N_GUARD::S(F)
- S(j);N_GUARD::S(F)
- S(j);N_GUARD::S(F),XS(j)
- P(a);OGATEB::QAR(C),XP(a)
- Refutation
- P(h);
- Try
- B(D);
- Vars
- S(d);CHECK,N_GUARD::S(F),XS(d)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD,XP(H)::S(F)
- P(e);OGATE,XS(F)::P(E),XP(e)
- P(g);XP(G)::S(J),XP(g)
- P(i);OGATEB,XP(H)::R(K)
- S(d);N_GUARD::S(F)
- S(j);N_GUARD::S(F)
- S(j);N_GUARD::S(F),XS(j)
- P(a);OGATEB::QAR(C),XP(a)
- P(h);OGATEB::QAB(C)
- Refutation
- Q(c);CHECK,N_SPINQ(c),XB(D)
- Try
- Q(C);
- Threat
- QAR1(C)
- Vars
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- P(i);OGATEB,XP(H)::R(K)
- P(h);OGATEB::QAB(C)
- Refutation
- Q(c);CHECK,N_SPINQ(c),XB(D)
- Try
- Q(C);
- Threat
- QAR1(C)
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- P(i);OGATEB,XP(H)::R(K)
- Refutation
- P(h);
- Try
- Q(C);
- Threat
- QAR2(C),XP(a)
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- S(d);N_GUARD,XP(H)::S(F)
- S(d);N_GUARD::S(F)
- Refutation
- P(a);XQ(C)
- Try
- Q(C);P_PINP(a)
- Threat
- QAR2(C),XP(a)
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- S(d);N_GUARD,XP(H)::S(F)
- S(d);N_GUARD::S(F)
- Refutation
- P(e);XS(F)
- Try
- Q(C);
- Threat
- DUALS(3)
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- S(d);N_GUARD::S(F)
- Refutation
- P(a);CHECK,XQ(C)
- Try
- Q(C);
- Threat
- QAR1(C)
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- S(d);N_GUARD,XQ(C)::S(F)
- Refutation
- P(h);
- Try
- Q(C);
- Threat
- QAB1(C),XP(h)
- Vars
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD,XP(H)::S(F)
- S(j);N_GUARD::S(F)
- S(j);N_GUARD::S(F),XS(j)
- Refutation
- Q(c);CHECK,N_SPINQ(c),XB(D)
- Try
- Q(C);
- Threat
- QAR1(C)
- Vars
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- S(j);N_GUARD::S(F),XS(j)
- Refutation
- Q(c);CHECK,N_SPINQ(c),XB(D)
- Try
- Q(C);P_PINP(h)
- Threat
- QAB1(C),XP(h)
- Vars
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD,XP(H)::S(F)
- S(j);N_GUARD::S(F)
- Refutation
- Q(c);CHECK,N_SPINQ(c),XB(D)
- Try
- Actual
- B(B);
- Vars
- Q(c);CHECK,N_SPINQ(c),OGATE,XB(D)::QAB(C),XQ(c)
- Q(c);CHECK,OGATEB::B(D),XQ(c)
- S(d);CHECK,N_GUARD::S(F),XS(d)
- B(l);XR(K)::S(J),XB(l)
- S(d);N_GUARD,XP(H)::S(F)
- P(e);OGATE,XS(F)::P(E),XP(e)
- P(g);XP(G)::S(J),XP(g)
- P(i);OGATEB,XP(H)::R(K)
- S(d);N_GUARD::S(F)
- S(j);N_GUARD::S(F)
- S(j);N_GUARD::S(F),XS(j)
- P(a);OGATEB::QAR(C),XP(a)
- P(h);OGATEB::QAB(C)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).