MESON Chess Problem Database
Problem Display
PID: 164087 (8/b7/2K1ppN1/1Q4Br/p1pk1rp1/3PpP2/qPB5/1N2R3 w - - 0 1)
Andersson, Knut
Springaren, 1987
#2
10 + 11
SOLUTION
- SOUND
- Sets
- 1...Qxb1
- 2.Qxc4#
- 1...Qa1
- 2.Qxc4#
- 1...Qxb2
- 2.Qxc4#
- 1...Qa3
- 2.Qxc4#
- 1...Rf5
- 2.Bxe3#
- 1...Bc5
- 2.Qxc5#
- 1...Bb6
- 2.Qxb6#
- 1...Bb8
- 2.Qc5#
- 2.Qb6#
- 1...cxd3
- 2.Qxd3#
- 1...c3
- 2.bxc3#
- 1...e5
- 2.Qd5#
- 1...fxg5
- 2.Qe5#
- 1...f5
- 2.Qe5#
- 1...Qxb1
- Tries
- 1.Sxf4?
- threat
- 2.Se2#
- 2.Sxe6#
- 1...gxf3
- 2.Sxe6#
- 1...Bc5
- 2.Qxc5#
- 1...e2
- 2.Sxe2#
- 2.Sxe6#
- 1...Rh2
- 2.Sxe6#
- 1...c3
- 2.Se2#
- 2.bxc3#
- 1...e5
- 2.Se2#
- 2.Se6#
- 2.Qd5#
- 1...cxd3!
- threat
- 1.Bxf6+?
- 1...Re5
- 2.Bxe5#
- 2.Qxe5#
- 1...e5
- 2.Qd5#
- 1...Rxf6!
- 1...Re5
- 1.Qb4?
- threat
- 2.Qc3#
- 2.Qd6#
- 1...Qxb2
- 2.Qd6#
- 2.Qxc4#
- 1...Rxg5
- 2.Qc3#
- 1...Qb3
- 2.Qd6#
- 1...Qa3
- 2.Qxc4#
- 1...Rf5
- 2.Bxe3#
- 2.Qc3#
- 1...Bc5
- 2.Qc3#
- 2.Qxc5#
- 1...Bb8
- 2.Qc3#
- 2.Qc5#
- 2.Qb6#
- 1...e2!
- threat
- 1.Qa5?
- threat
- 2.Qc3#
- 2.Qd8#
- 2.Qxa7#
- 1...Qxb2
- 2.Qd8#
- 1...Rxg5
- 2.Qc3#
- 1...cxd3
- 2.Qc3#
- 1...e2
- 2.Qxa7#
- 1...Qb3
- 2.Qd8#
- 1...Rf5
- 2.Bxe3#
- 2.Qc3#
- 1...Rh7
- 2.Qc3#
- 1...Rh8
- 2.Qc3#
- 2.Qxa7#
- 1...Bc5
- 2.Qc3#
- 2.Qxc5#
- 1...Bb6
- 2.Qc3#
- 2.Qxb6#
- 1...Bb8
- 2.Qc3#
- 2.Qb6#
- 2.Qc5#
- 1...c3
- 2.Qxc3#
- 2.Qxa7#
- 2.bxc3#
- 1...Qa3!
- threat
- 1.Qb8?
- threat
- 2.Qxf4#
- 2.Qd6#
- 2.Qxa7#
- 2.Qd8#
- 1...Qxb2
- 2.Qxf4#
- 2.Qd6#
- 2.Qd8#
- 1...Rxf3
- 2.Qd6#
- 2.Qxa7#
- 2.Qd8#
- 1...Rxg5
- 2.Qxf4#
- 1...cxd3
- 2.Qxf4#
- 1...fxg5
- 2.Qe5#
- 2.Qd6#
- 2.Qxa7#
- 2.Qd8#
- 1...e2
- 2.Qxf4#
- 2.Qxa7#
- 1...Qb3
- 2.Qxf4#
- 2.Qd6#
- 2.Qd8#
- 1...Qa3
- 2.Qxf4#
- 1...Re4
- 2.Qd6#
- 2.Qxa7#
- 2.Qd8#
- 1...Rf5
- 2.Bxe3#
- 1...Rh7
- 2.Qxf4#
- 2.Qd6#
- 1...Rh8
- 2.Qxf4#
- 2.Qd6#
- 2.Qxa7#
- 1...Bc5
- 2.Qxf4#
- 1...Bb6
- 2.Qxf4#
- 2.Qd6#
- 2.Qxb6#
- 1...c3
- 2.Qxf4#
- 2.Qxa7#
- 2.bxc3#
- 1...e5
- 2.Qd6#
- 2.Qxa7#
- 2.Qd8#
- 1...Bxb8!
- threat
- 1.Sxf4?
- Keys
- 1.Qf5!
- threat
- 2.Qxf4#
- 1...Rxf3
- 2.Qe4#
- 1...Rxf5
- 2.Bxe3#
- 1...exf5
- 2.Bxf6#
- 1...fxg5
- 2.Qe5#
- 1...Re4
- 2.Qxe4#
- 1...Bb8
- 2.Qc5#
- 1...e5
- 2.Qd7#
- threat
- 1.Qf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 9
- Sets
- Q(a);N_GUARD,XS(A)::QAR1(G),XP(d)
- Q(a);N_GUARD::QAR1(G),XP(d)
- Q(a);N_GUARD,XP(C)::QAR1(G),XP(d)
- R(f);OGATE::B(H),XP(b)
- B(k);N_GUARD::QAB1(G),XB(k)
- B(k);N_GUARD::QAB(G),XB(k)
- P(d);OGATE,XP(E)::QAR1(G),XP(d)
- P(d);OGATE::P(C),XP(d)
- P(i);N_GUARD::QAR1(G)
- P(j);N_GUARD,XB(H)::QAB1(G)
- P(j);N_GUARD::QAB1(G)
- Tries
- Try
- S(J);XR(f)
- Threat
- DUALS(2)
- Vars
- P(g);XP(F)::S(J),XP(i)
- B(k);N_GUARD::QAB1(G),XB(k)
- R(h);::S(J),XP(i)
- Refutation
- P(d);XP(E)
- Try
- B(H);CHECK,XP(j)
- Vars
- P(i);P_SPINP(i)::QAR1(G)
- Refutation
- R(f);XB(H)
- Try
- Q(G);P_PINP(d)
- Threat
- DUALS(2)
- Vars
- R(h);XB(H)::QAB1(G)
- Q(a);::QAR2(G)
- Q(a);N_GUARD::QAR1(G),XP(d)
- Refutation
- P(b);
- Try
- Q(G);
- Threat
- DUALS(3)
- Vars
- Q(a);XP(C)::QAR(G)
- R(h);XB(H)::QAB1(G)
- P(d);XP(E)::QAB1(G)
- P(b);::QAB(G),XB(k)
- Q(a);::QAR(G)
- R(h);::QAB1(G)
- Refutation
- Q(a);
- Try
- Q(G);
- Threat
- DUALS(4)
- Vars
- R(h);XB(H)::QAR2(G),XR(f)
- P(d);XP(E)::QAR2(G),XR(f)
- Q(a);::QAR2(G),XR(f)
- R(f);OGATE::B(H),XP(b)
- B(k);::QAR2(G),XR(f)
- Refutation
- B(k);XQ(G)
- Try
- Actual
- Q(G);
- Threat
- QAR2(G),XR(f)
- Vars
- R(f);N_GUARD,XP(F)::QAR1(G)
- R(f);OGATE,XQ(G)::B(H),XP(b)
- P(i);N_GUARD,XQ(G)::B(H),XP(j)
- P(j);N_GUARD,XB(H)::QAB1(G)
- R(f);N_GUARD::QAR1(G),XR(f)
- B(k);N_GUARD::QAB1(G)
- P(i);OGATE::QAR(G)
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).