MESON Chess Problem Database
Problem Display
PID: 267794 (3bK3/2p2P1p/3kPrRr/3P4/1PP2q2/5NN1/3p1p2/3RQ1B1 w - - 0 1)
Ling, John Francis
The Problemist, 1955
#2
12 + 9
SOLUTION
- SOUND
- Sets
- 1...Qe5
- 2.Qxe5#
- 1...Qg5
- 2.Se4#
- 1...Qxc4
- 2.Qe5#
- 1...Qe4
- 2.Sxe4#
- 1...Qg4
- 2.Qe5#
- 1...Qh4
- 2.Qe5#
- 1...Rxe6+
- 2.Qxe6#
- 1...dxe1Q
- 2.c5#
- 1...dxe1S
- 2.c5#
- 1...dxe1B
- 2.c5#
- 1...dxe1R
- 2.c5#
- 1...fxe1Q
- 2.Bc5#
- 1...fxe1S
- 2.Bc5#
- 1...fxe1B
- 2.Bc5#
- 1...fxe1R
- 2.Bc5#
- 1...f1Q
- 2.Bc5#
- 1...f1S
- 2.Bc5#
- 1...f1B
- 2.Bc5#
- 1...f1R
- 2.Bc5#
- 1...Qe5
- Tries
- 1.f8Q+?
- 1...Be7
- 2.Qxe7#
- 1...Rxf8+!
- 1...Be7
- 1.f8B+?
- 1...Be7
- 2.Bxe7#
- 1...Rxf8+!
- 1...Be7
- 1.f8Q+?
- Keys
- 1.e7!
- threat
- 2.exd8Q#
- 2.exd8R#
- 1...Qxg3
- 2.exd8Q#
- 2.exd8R#
- 1...Qxf3
- 2.exd8Q#
- 2.exd8R#
- 1...Qxc4
- 2.Qe5#
- 2.exd8Q#
- 2.exd8R#
- 1...Rfxg6
- 2.exd8Q#
- 2.exd8R#
- 1...Rhxg6
- 2.exd8Q#
- 2.exd8R#
- 1...Bxe7
- 2.Qxe7#
- 1...dxe1Q
- 2.c5#
- 1...dxe1S
- 2.c5#
- 2.exd8Q#
- 2.exd8R#
- 1...dxe1B
- 2.c5#
- 2.exd8Q#
- 2.exd8R#
- 1...dxe1R
- 2.c5#
- 1...fxe1Q
- 2.Bc5#
- 1...fxe1S
- 2.Bc5#
- 2.exd8Q#
- 2.exd8R#
- 1...fxe1B
- 2.Bc5#
- 2.exd8Q#
- 2.exd8R#
- 1...fxe1R
- 2.Bc5#
- 1...fxg1Q
- 2.exd8Q#
- 2.exd8R#
- 1...fxg1S
- 2.exd8Q#
- 2.exd8R#
- 1...fxg1B
- 2.exd8Q#
- 2.exd8R#
- 1...fxg1R
- 2.exd8Q#
- 2.exd8R#
- 1...hxg6
- 2.exd8Q#
- 2.exd8R#
- 1...f1Q
- 2.Bc5#
- 2.exd8Q#
- 2.exd8R#
- 1...f1S
- 2.Bc5#
- 2.exd8Q#
- 2.exd8R#
- 1...f1B
- 2.Bc5#
- 2.exd8Q#
- 2.exd8R#
- 1...f1R
- 2.Bc5#
- 2.exd8Q#
- 2.exd8R#
- 1...Qe3
- 2.Sf5#
- 1...Qe5
- 2.Qxe5#
- 1...Qg5
- 2.Se4#
- 2.exd8Q#
- 2.exd8R#
- 1...Qd4
- 2.Sf5#
- 2.exd8Q#
- 2.exd8R#
- 1...Qe4
- 2.Sxe4#
- 1...Qg4
- 2.Qe5#
- 1...Qh4
- 2.Sf5#
- 2.Qe5#
- 2.exd8Q#
- 2.exd8R#
- 1...Qf5
- 2.Sxf5#
- 1...Re6
- 2.Qxe6#
- 1...Rh1
- 2.exd8Q#
- 2.exd8R#
- 1...Rh2
- 2.exd8Q#
- 2.exd8R#
- 1...Rh3
- 2.exd8Q#
- 2.exd8R#
- 1...Rh4
- 2.exd8Q#
- 2.exd8R#
- 1...Rh5
- 2.exd8Q#
- 2.exd8R#
- threat
- 1.e7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 11
- Sets
- Q(c);N_GUARD,P_PINP(I)::QAB1(B),XQ(c)
- Q(c);N_GUARD::S(E)
- Q(c);N_GUARD,XP(G)::QAB1(B)
- Q(c);N_GUARD,P_PINP(I)::S(E),XQ(c)
- Q(c);N_GUARD::QAB1(B)
- R(e);CHECK,OGATE,P_SPINR(e),XP(I)::QAR1(B),XR(e)
- P(a);P_PINP(I),XQ(B)::P(G)
- P(a);XQ(B)::P(G)
- P(b);OGATE,P_PINP(I),XQ(B)::B(C)
- P(b);OGATE,XQ(B)::B(C)
- P(b);OGATE::B(C)
- Tries
- Try
- P(K);CHECK
- Vars
- B(i);N_GUARD,P_SPINB(i)::QAB1(K),XB(i)
- Refutation
- R(e);CHECK,XQ(K)
- Try
- P(K);CHECK
- Vars
- B(i);N_GUARD,P_SPINB(i)::B(K),XB(i)
- Refutation
- R(e);CHECK,XB(K)
- Try
- Actual
- P(I);P_PINR(e)
- Threat
- PXB(i)=Q
- Vars
- Q(c);XS(E)::PXB(i)=Q
- Q(c);XS(D)::PXB(i)=Q
- R(e);N_SPINR(e),XR(J)::PXB(i)=Q
- R(f);N_SPINR(e),XR(J)::PXB(i)=Q
- B(i);OGATE,XP(I)::QAB1(B),XB(i)
- P(a);P_PINP(I),XQ(B)::P(G)
- P(b);OGATE,P_PINP(I),XQ(B)::B(C)
- P(b);XB(C)::PXB(i)=Q
- P(h);N_SPINR(e),XR(J)::PXB(i)=Q
- Q(c);N_GUARD,P_PINP(I)::S(E)
- Q(c);N_GUARD,P_PINP(I)::QAB1(B),XQ(c)
- Q(c);N_GUARD,P_PINP(I)::S(E),XQ(c)
- Q(c);N_GUARD::QAB1(B)
- Q(c);N_GUARD::S(E),XQ(c)
- R(e);N_GUARD,P_PINP(I)::QAR1(B),XR(e)
- R(f);::PXB(i)=Q
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).