MESON Chess Problem Database
Problem Display
PID: 204589 (1BbK4/1p2Pp2/2kP1rN1/Ppn5/P1Q1q3/1r5B/2p1N3/2RR4 w - - 0 1)
Ling, John Francis
The Problemist, 1954
#2
12 + 10
SOLUTION
- SOUND
- Sets
- 1...Qh1
- 2.Sd4#
- 2.Se5#
- 1...Qg2
- 2.Sd4#
- 2.Se5#
- 1...Qd3
- 2.Se5#
- 1...Qf3
- 2.Sd4#
- 2.Se5#
- 1...Qd5
- 2.Qxd5#
- 1...Qf5
- 2.Sd4#
- 1...Qxg6
- 2.Sd4#
- 2.Qd5#
- 1...Qxe2
- 2.Qd5#
- 1...Qe3
- 2.Qd5#
- 1...Qxc4
- 2.Se5#
- 1...Qd4
- 2.Sxd4#
- 1...Qf4
- 2.Qd5#
- 1...Qg4
- 2.Se5#
- 2.Qd5#
- 1...Qh4
- 2.Se5#
- 2.Qd5#
- 1...Qe5
- 2.Sxe5#
- 1...Qe6
- 2.Sd4#
- 1...Qxe7+
- 2.Sxe7#
- 1...Ra3
- 2.Qxb5#
- 2.axb5#
- 1...Rc3
- 2.Qxb5#
- 2.axb5#
- 1...Rd3
- 2.axb5#
- 1...Re3
- 2.Qxb5#
- 2.axb5#
- 1...Rbf3
- 2.Qxb5#
- 2.axb5#
- 1...Rg3
- 2.Qxb5#
- 2.axb5#
- 1...Rxh3
- 2.Qxb5#
- 2.axb5#
- 1...Rxd6+
- 2.Rxd6#
- 1...Bd7
- 2.Bxd7#
- 1...cxd1Q
- 2.Qxc5#
- 1...cxd1S
- 2.Qxe4#
- 2.Qxc5#
- 1...cxd1B
- 2.Qxe4#
- 2.Qxc5#
- 1...cxd1R
- 2.Qxc5#
- 1...b4
- 2.Qb5#
- 1...Qh1
- Tries
- 1.Bg2?
- threat
- 2.Sd4#
- 2.Se5#
- 2.Bxe4#
- 1...Rxd6+
- 2.Rxd6#
- 1...Qxg2
- 2.Sd4#
- 2.Se5#
- 1...Rxg6
- 2.Sd4#
- 2.Bxe4#
- 1...cxd1Q
- 2.Se5#
- 2.Qxc5#
- 1...cxd1R
- 2.Se5#
- 2.Qxc5#
- 1...bxc4
- 2.Se5#
- 1...fxg6
- 2.Sd4#
- 2.Bxe4#
- 1...b6
- 2.Bxe4#
- 1...Qf3
- 2.Sd4#
- 2.Se5#
- 1...Qd5
- 2.Sd4#
- 2.Se5#
- 2.Bxd5#
- 2.Qxd5#
- 1...Rd3
- 2.Se5#
- 2.axb5#
- 1...Re3
- 2.Sd4#
- 2.Se5#
- 2.Qxb5#
- 2.axb5#
- 1...Rbf3
- 2.Qxb5#
- 2.axb5#
- 1...Rf4
- 2.Sd4#
- 2.Se5#
- 1...Rf5
- 2.Sd4#
- 1...Re6
- 2.Sd4#
- 1...Bf5
- 2.Sd4#
- 2.Se5#
- 1...Be6
- 2.Sd4#
- 2.Se5#
- 1...Rff3!
- threat
- 1.e8Q+?
- 1...Bd7
- 2.Bxd7#
- 2.Qxd7#
- 2.Qexe4#
- 1...Qxe8+!
- 1...Bd7
- 1.e8B+?
- 1...Bd7
- 2.Bhxd7#
- 2.Bexd7#
- 1...Qxe8+!
- 1...Bd7
- 1.Bg2?
- Keys
- 1.d7!
- threat
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qxe7+
- 2.Sxe7#
- 1...Qxg6
- 2.Sd4#
- 2.Qd5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qxe2
- 2.Qd5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qxc4
- 2.Se5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rxh3
- 2.Qxb5#
- 2.axb5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rxg6
- 2.dxc8Q#
- 2.dxc8R#
- 1...Bxd7
- 2.Bxd7#
- 1...cxd1Q
- 2.Qxc5#
- 1...cxd1S
- 2.Qxe4#
- 2.Qxc5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...cxd1B
- 2.Qxe4#
- 2.Qxc5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...cxd1R
- 2.Qxc5#
- 1...bxa4
- 2.dxc8Q#
- 2.dxc8R#
- 1...bxc4
- 2.dxc8Q#
- 2.dxc8R#
- 1...fxg6
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qh1
- 2.Sd4#
- 2.Se5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qg2
- 2.Sd4#
- 2.Se5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qd3
- 2.Se5#
- 1...Qf3
- 2.Sd4#
- 2.Se5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qd5
- 2.Qxd5#
- 1...Qf5
- 2.Sd4#
- 1...Qe3
- 2.Qd5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qd4
- 2.Sxd4#
- 1...Qf4
- 2.Qd5#
- 1...Qg4
- 2.Se5#
- 2.Qd5#
- 1...Qh4
- 2.Se5#
- 2.Qd5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qe5
- 2.Sxe5#
- 1...Qe6
- 2.Sd4#
- 1...Rb1
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rb2
- 2.dxc8Q#
- 2.dxc8R#
- 1...Ra3
- 2.Qxb5#
- 2.axb5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rc3
- 2.Qxb5#
- 2.axb5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rd3
- 2.axb5#
- 1...Re3
- 2.Qxb5#
- 2.axb5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rbf3
- 2.Qxb5#
- 2.axb5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rg3
- 2.Qxb5#
- 2.axb5#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rb4
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rf1
- 2.Rd6#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rf2
- 2.Rd6#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rff3
- 2.Rd6#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rf4
- 2.Rd6#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rf5
- 2.Rd6#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Rd6
- 2.Rxd6#
- 1...Re6
- 2.dxc8Q#
- 2.dxc8R#
- 1...b4
- 2.Qb5#
- 2.dxc8Q#
- 2.dxc8R#
- threat
- 1.d7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 4
- Sets
- Q(c);N_GUARD,P_PINP(H)::S(I)
- Q(c);N_GUARD,P_PINP(H)::QAB1(F),XQ(c)
- Q(c);N_GUARD::S(C)
- Q(c);N_GUARD,XS(C)::QAB1(F)
- Q(c);N_GUARD::QAB1(F)
- Q(c);N_GUARD,N_SPINS(e),XQ(F)::S(I)
- Q(c);N_GUARD,P_PINP(H)::S(C),XQ(c)
- Q(c);N_GUARD::S(I),XQ(c)
- Q(c);CHECK,XP(J)::S(I),XQ(c)
- R(b);N_GUARD,P_PINP(H)::P(E),XP(d)
- R(g);CHECK,OGATE,XP(H)::R1(B),XR(g)
- B(j);N_GUARD::B(D),XB(j)
- P(a);P_PINP(H),XR(B)::QAR1(F),XS(e)
- P(d);S_CUTR(b)::QAB1(F)
- Tries
- Try
- B(D);P_PINQ(c)
- Threat
- DUALS(3)
- Vars
- R(g);CHECK,OGATE,XP(H)::R1(B),XR(g)
- P(d);N_SPINS(e),XQ(F)::S(I)
- P(h);::B(D),XQ(c)
- R(g);::S(C)
- Refutation
- R(g);N_SPINQ(c)
- Try
- P(J);CHECK
- Refutation
- Q(c);CHECK,XQ(J)
- Try
- P(J);CHECK
- Refutation
- Q(c);CHECK,XB(J)
- Try
- Actual
- P(H);
- Threat
- PXB(j)=Q
- Vars
- Q(c);CHECK,XP(J)::S(I),XQ(c)
- R(g);XS(I)::PXB(j)=Q
- B(j);OGATE,XP(H)::B(D),XB(j)
- P(a);P_PINP(H),XR(B)::QAR1(F),XS(e)
- P(d);XP(E)::PXB(j)=Q
- P(d);N_SPINS(e),XQ(F)::PXB(j)=Q
- P(i);XS(I)::PXB(j)=Q
- Q(c);N_GUARD,P_PINP(H)::S(I)
- Q(c);N_GUARD,P_PINP(H)::QAB1(F),XQ(c)
- Q(c);N_GUARD::S(C)
- Q(c);N_GUARD,P_PINP(H)::S(C),XQ(c)
- Q(c);N_GUARD::QAB1(F)
- Q(c);N_GUARD::S(I),XQ(c)
- R(b);::PXB(j)=Q
- R(b);N_GUARD,P_PINP(H)::P(E),XP(d)
- R(g);N_GUARD,P_PINP(H)::R1(B),XR(g)
- R(g);::PXB(j)=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).