MESON Chess Problem Database
Problem Display
PID: 145260 (K3B3/Npk4b/PN2R3/8/2q4B/8/4rpp1/4r1QR w - - 0 1)
Ling, John Francis
The Problemist, 1956
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Qa2
- 2.Sb5#
- 1...Qb5
- 2.Sxb5#
- 1...Qd5
- 2.Sxd5#
- 1...Qxa6
- 2.Sd5#
- 1...Qc1
- 2.Sd5#
- 2.Sb5#
- 1...Qc2
- 2.Sd5#
- 2.Sb5#
- 1...Qc3
- 2.Sd5#
- 2.Sb5#
- 1...Qa4
- 2.Sd5#
- 1...Qb4
- 2.Sd5#
- 1...Qd4
- 2.Sb5#
- 1...Qe4
- 2.Sb5#
- 1...Qf4
- 2.Sd5#
- 2.Sb5#
- 1...Qg4
- 2.Sd5#
- 2.Sb5#
- 1...Be4
- 2.Qh2#
- 1...gxh1Q
- 2.Qg7#
- 1...gxh1S
- 2.Qg7#
- 1...gxh1B
- 2.Qg7#
- 1...gxh1R
- 2.Qg7#
- 1...Qa2
- Tries
- 1.Qh2+?
- 1...Qf4
- 2.Sd5#
- 2.Sb5#
- 1...Re5!
- 1...Qf4
- 1.Qh2+?
- Keys
- 1.axb7!
- threat
- 2.b8Q#
- 2.b8B#
- 1...Rxg1
- 2.b8Q#
- 2.b8B#
- 1...fxg1Q
- 2.b8Q#
- 2.b8B#
- 1...fxg1S
- 2.b8Q#
- 2.b8B#
- 1...fxg1B
- 2.b8Q#
- 2.b8B#
- 1...fxg1R
- 2.b8Q#
- 2.b8B#
- 1...gxh1Q
- 2.Qg7#
- 1...gxh1S
- 2.Qg7#
- 2.b8Q#
- 2.b8B#
- 1...gxh1B
- 2.Qg7#
- 1...gxh1R
- 2.Qg7#
- 2.b8Q#
- 2.b8B#
- 1...Qc6
- 2.Rxc6#
- 1...f1Q
- 2.b8Q#
- 2.b8B#
- 1...f1S
- 2.b8Q#
- 2.b8B#
- 1...f1B
- 2.b8Q#
- 2.b8B#
- 1...f1R
- 2.b8Q#
- 2.b8B#
- 1...Qa2
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qb3
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qd3
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qb5
- 2.Sxb5#
- 2.b8Q#
- 2.b8B#
- 1...Qd5
- 2.Sxd5#
- 1...Qa6
- 2.Sd5#
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qc1
- 2.Sd5#
- 2.Sb5#
- 2.b8Q#
- 2.b8B#
- 1...Qc2
- 2.Sd5#
- 2.Sb5#
- 2.b8Q#
- 2.b8B#
- 1...Qc3
- 2.Sd5#
- 2.Sb5#
- 2.b8Q#
- 2.b8B#
- 1...Qa4
- 2.Sd5#
- 2.b8Q#
- 2.b8B#
- 1...Qb4
- 2.Sd5#
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qd4
- 2.Sb5#
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qe4
- 2.Sb5#
- 1...Qf4
- 2.Sd5#
- 2.Sb5#
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qg4
- 2.Sd5#
- 2.Sb5#
- 2.Rc6#
- 2.b8Q#
- 2.b8B#
- 1...Qc5
- 2.b8Q#
- 2.b8B#
- 1...Ra1
- 2.b8Q#
- 2.b8B#
- 1...Rb1
- 2.b8Q#
- 2.b8B#
- 1...Rc1
- 2.b8Q#
- 2.b8B#
- 1...Rd1
- 2.b8Q#
- 2.b8B#
- 1...Rf1
- 2.b8Q#
- 2.b8B#
- 1...Ra2
- 2.b8Q#
- 2.b8B#
- 1...Rb2
- 2.b8Q#
- 2.b8B#
- 1...Rc2
- 2.b8Q#
- 2.b8B#
- 1...Rd2
- 2.b8Q#
- 2.b8B#
- 1...Re3
- 2.b8Q#
- 2.b8B#
- 1...Re4
- 2.b8Q#
- 2.b8B#
- 1...Re5
- 2.b8Q#
- 2.b8B#
- 1...Bb1
- 2.b8Q#
- 2.b8B#
- 1...Bc2
- 2.b8Q#
- 2.b8B#
- 1...Bd3
- 2.b8Q#
- 2.b8B#
- 1...Be4
- 2.Qh2#
- 1...Bf5
- 2.b8Q#
- 2.b8B#
- 1...Bg6
- 2.b8Q#
- 2.b8B#
- 1...Bg8
- 2.b8Q#
- 2.b8B#
- threat
- 1.axb7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 8
- Sets
- Q(e);N_GUARD::S(G)
- Q(e);N_GUARD::S(G),XQ(e)
- Q(e);N_GUARD::S(E),XQ(e)
- Q(e);N_GUARD,P_PINS(G),XP(D)::S(E)
- Q(e);N_GUARD::S(E)
- B(h);S_CUTQ(e),S_CUTR(b)::QAB(A)
- P(d);OGATE,XR(B)::QAR(A)
- Tries
- Try
- Q(A);CHECK
- Refutation
- R(b);P_SPINR(b)
- Try
- Actual
- P(D);XP(f)
- Threat
- P=Q
- Vars
- R(a);XQ(A)::P=Q
- P(c);XQ(A)::P=Q
- P(d);OGATE,P_PINP(D),XR(B)::QAR(A)
- Q(e);N_GUARD,P_PINP(D)::R1(F),XQ(e)
- P(c);::P=Q
- Q(e);N_GUARD,P_PINP(D)::S(E),XQ(e)
- Q(e);N_GUARD,P_PINP(D)::S(G)
- Q(e);::P=Q
- R(a);P_PINS(G)::P=Q
- R(a);::P=Q
- R(b);P_PINS(G)::P=Q
- R(b);::P=Q
- B(h);::P=Q
- B(h);P_PINP(D),S_CUTQ(e),S_CUTR(b)::QAB(A)
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).