MESON Chess Problem Database
Problem Display
PID: 257956 (1bb2R1r/2ppPNPB/Rr6/1q5k/5Q1p/4B3/4p2K/6n1 w - - 0 1)
Alexander, Frederick Forrest Lawrie
British Chess Magazine, 1934
#2
9 + 11
SOLUTION
- SOUND
- Sets
- 1...Qd3
- 2.Qg5#
- 1...Qa4
- 2.Qg5#
- 2.Qf5#
- 1...Qc4
- 2.Qg5#
- 2.Qf5#
- 1...Qxa6
- 2.Qg5#
- 2.Qf5#
- 1...Qc6
- 2.Qg5#
- 2.Qf5#
- 1...Qb1
- 2.Qg5#
- 1...Qb2
- 2.Qg5#
- 2.Qf5#
- 1...Qb3
- 2.Qg5#
- 2.Qf5#
- 1...Qb4
- 2.Qg5#
- 2.Qf5#
- 1...Qf5
- 2.Qxf5#
- 1...Qg5
- 2.Qxg5#
- 1...Rg6
- 2.Bxg6#
- 1...Rh6
- 2.Rxh6#
- 1...Rb7
- 2.Bg6#
- 2.Rh6#
- 1...Sf3+
- 2.Qxf3#
- 1...Sh3
- 2.Qf3#
- 1...d5
- 2.Qg5#
- 1...Qd3
- Tries
- 1.Se5?
- threat
- 2.Rf5#
- 2.Qg5#
- 2.Qg4#
- 2.Qf5#
- 1...Sf3+
- 2.Qxf3#
- 1...Rxf8
- 2.Qg5#
- 2.Qg4#
- 1...Qd3
- 2.Qg5#
- 2.Qg4#
- 1...Qa4
- 2.Rf5#
- 2.Qg5#
- 2.Qf5#
- 1...Qc4
- 2.Rf5#
- 2.Qg5#
- 2.Qf5#
- 1...Qb1
- 2.Qg5#
- 2.Qg4#
- 1...Qb4
- 2.Rf5#
- 2.Qg5#
- 2.Qf5#
- 1...Rf6
- 2.Qg5#
- 2.Qg4#
- 1...Rg6
- 2.Bxg6#
- 1...Sh3
- 2.Qf3#
- 2.Qg4#
- 1...h3
- 2.Rf5#
- 2.Qg5#
- 2.Qg4#
- 1...d5
- 2.Qg5#
- 1...d6
- 2.Bg6#
- 2.Qg5#
- 2.Qh6#
- 2.Qf7#
- 1...Qxe5!
- threat
- 1.g8Q?
- threat
- 2.Qfg4#
- 2.Qgg4#
- 1...Sf3+
- 2.Qxf3#
- 1...Qe5
- 2.Qxe5#
- 2.Qg4#
- 1...Qa4
- 2.Qe5#
- 2.Qfg5#
- 2.Qf5#
- 2.Qgg4#
- 2.Qgg5#
- 1...Qc4
- 2.Qe5#
- 2.Qfg5#
- 2.Qf5#
- 2.Qgg4#
- 2.Qgg5#
- 1...Qb4
- 2.Qe5#
- 2.Qfg5#
- 2.Qf5#
- 2.Qgg4#
- 2.Qgg5#
- 1...Qf5
- 2.Qxf5#
- 1...Qg5
- 2.Qfxg5#
- 2.Qgxg5#
- 1...Rg6
- 2.Bxg6#
- 2.Qxg6#
- 1...c5
- 2.Qg4#
- 2.Qg5#
- 1...c6
- 2.Bg6#
- 2.Qg4#
- 2.Qg6#
- 1...d5
- 2.Qfg5#
- 2.Qgg5#
- 1...d6
- 2.Bg6#
- 2.Qh6#
- 2.Qg6#
- 1...Rxg8!
- threat
- 1.g8R?
- threat
- 2.Qg4#
- 1...Sf3+
- 2.Qxf3#
- 1...Qe5
- 2.Qxe5#
- 1...Qa4
- 2.Rg5#
- 2.Qe5#
- 2.Qg5#
- 2.Qf5#
- 1...Qc4
- 2.Rg5#
- 2.Qe5#
- 2.Qg5#
- 2.Qf5#
- 1...Qb4
- 2.Rg5#
- 2.Qe5#
- 2.Qg5#
- 2.Qf5#
- 1...Qf5
- 2.Qxf5#
- 1...Qg5
- 2.Rxg5#
- 2.Qxg5#
- 1...Rg6
- 2.Bxg6#
- 1...c5
- 2.Rg5#
- 1...c6
- 2.Bg6#
- 1...d5
- 2.Rg5#
- 2.Qg5#
- 1...d6
- 2.Bg6#
- 2.Qh6#
- 1...Rxg8!
- threat
- 1.Se5?
- Keys
- 1.Sh6!
- threat
- 2.Qg4#
- 1...Sf3+
- 2.Qxf3#
- 1...Rxh6
- 2.Rxh6#
- 1...Qg5
- 2.Qxg5#
- 1...Qa4
- 2.Rf5#
- 2.Qe5#
- 2.Qg5#
- 2.Qf5#
- 1...Qc4
- 2.Rf5#
- 2.Qe5#
- 2.Qg5#
- 2.Qf5#
- 1...Qb4
- 2.Rf5#
- 2.Qe5#
- 2.Qg5#
- 2.Qf5#
- 1...Qe5
- 2.Qxe5#
- 1...Qf5
- 2.Rxf5#
- 2.Qxf5#
- 1...Rg6
- 2.Bxg6#
- 1...c5
- 2.Rf5#
- 1...c6
- 2.e8Q#
- 2.e8B#
- 1...d5
- 2.Qg5#
- 1...d6
- 2.Qf7#
- threat
- 1.Sh6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 4
- Sets
- Q(d);N_GUARD::QAR1(C)
- Q(d);N_GUARD::QAR2(C),XQ(d)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- R(f);N_GUARD::B(H),XR(f)
- R(f);OGATE::R1(D),XR(f)
- S(a);CHECK,N_GUARD::QAB(C),XS(a)
- S(a);N_GUARD::QAB(C)
- P(h);S_CUTQ(d)::QAR1(C)
- Tries
- Try
- S(F);
- Threat
- DUALS(4)
- Vars
- S(a);CHECK,N_GUARD::QAB(C),XS(a)
- R(f);N_GUARD::B(H),XR(f)
- P(h);::QAR1(C)
- Refutation
- Q(d);P_PINQ(C),XS(F)
- Try
- P(G);
- Threat
- DUALS(2)
- Vars
- S(a);CHECK,N_GUARD::QAB(C),XS(a)
- Q(d);N_GUARD::QAR2(C),XQ(d)
- Refutation
- R(k);XQ(G)
- Try
- P(G);
- Threat
- QAB1(C)
- Vars
- S(a);CHECK,N_GUARD::QAB(C),XS(a)
- Q(d);N_GUARD,P_PINQ(C)::QAR(C),XQ(d)
- Q(d);N_GUARD::QAR2(C),XQ(d)
- R(f);N_GUARD::B(H),XR(f)
- P(g);P_PINQ(C),S_CUTQ(d)::R1(G)
- P(g);P_PINQ(C),S_CUTR(f)::B(H)
- Refutation
- R(k);XR(G)
- Try
- Actual
- S(F);
- Threat
- QAB1(C)
- Vars
- S(a);CHECK,N_GUARD::QAB(C),XS(a)
- R(f);OGATE,XS(F)::R1(D),XR(f)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- Q(d);N_GUARD,P_PINQ(C)::QAR(C),XQ(d)
- R(f);N_GUARD::B(H),XR(f)
- P(g);P_PINQ(C),S_CUTQ(d)::R(I)
- P(g);P_PINQ(C),S_CUTR(f)::P=Q
- P(h);S_CUTQ(d)::QAR1(C)
- P(h);S_CUTR(f)::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).