MESON Chess Problem Database
Problem Display
PID: 217616 (4BK2/8/p2pN1Q1/7n/4q3/1PPk2p1/1P4R1/1n3N2 w - - 0 1)
Bernard, Henry D'Oyly
British Chess Magazine, 1920
#2
9 + 7
SOLUTION
- SOUND
- Sets
- 1...Qf5+
- 2.Qxf5#
- 1...Qxg6
- 2.Bxg6#
- 1...Sd2
- 2.Rxd2#
- 1...Sa3
- 2.Rd2#
- 1...Sxc3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sf6
- 2.Sf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Qf5+
- Tries
- 1.Kf7?
- 1...Qf5+
- 2.Qxf5#
- 1...Sxc3
- 2.Rd2#
- 1...Sd2
- 2.Rxd2#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sf6
- 2.Sf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Qxg6+!
- 1...Qf5+
- 1.Kg8?
- 1...Qxg6+
- 2.Bxg6#
- 1...Sxc3
- 2.Rd2#
- 1...Qf5
- 2.Qxf5#
- 1...Sd2
- 2.Rxd2#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Sf6+!
- 1...Qxg6+
- 1.Ba4?
- 1...Qf5+
- 2.Qxf5#
- 1...Sxc3
- 2.Rd2#
- 1...Sd2
- 2.Rxd2#
- 1...Sf6
- 2.Sf4#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Qxg6!
- 1...Qf5+
- 1.Bc6?
- threat
- 2.Bxe4#
- 2.Qxe4#
- 1...Qf5+
- 2.Qxf5#
- 1...Sxc3
- 2.Rd2#
- 1...Sd2
- 2.Rxd2#
- 1...Sf6
- 2.Sf4#
- 1...d5
- 2.Sc5#
- 1...Qxg6!
- threat
- 1.Bd7?
- 1...Qf5+
- 2.Qxf5#
- 1...Sxc3
- 2.Rd2#
- 1...Sd2
- 2.Rxd2#
- 1...Sf6
- 2.Sf4#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Qxg6!
- 1...Qf5+
- 1.Bf7?
- 1...Qxg6
- 2.Bxg6#
- 1...Sxc3
- 2.Rd2#
- 1...Qf5
- 2.Qxf5#
- 1...Sd2
- 2.Rxd2#
- 1...Sf6
- 2.Sf4#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sg7
- 2.Sf4#
- 1...d5
- 2.Sc5#
- 1...a5!
- 1...Qxg6
- 1.Qf5?
- 1...Sxc3
- 2.Rd2#
- 1...Sd2
- 2.Rxd2#
- 1...Sf6
- 2.Sf4#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Qxf5+!
- 1...Sxc3
- 1.Qh7?
- 1...Qf5+
- 2.Qxf5#
- 1...Sxc3
- 2.Rd2#
- 1...Qg6
- 2.Bxg6#
- 2.Qxg6#
- 1...Sd2
- 2.Rxd2#
- 1...Sf6
- 2.Sf4#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Sxf4#
- 1...Sg7
- 2.Sf4#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Sc5#
- 1...Qxh7!
- 1...Qf5+
- 1.Qxg3+?
- 1...Qf3+
- 2.Qxf3#
- 1...Qe3
- 2.Bg6#
- 2.Qxe3#
- 1...Sxg3!
- 1...Qf3+
- 1.Kf7?
- Keys
- 1.Sd4!
- 1...Qf5+
- 2.Qxf5#
- 1...Qxg6
- 2.Bxg6#
- 1...Sxc3
- 2.Rd2#
- 1...Sd2
- 2.Rxd2#
- 1...Sa3
- 2.Rd2#
- 1...Sf4
- 2.Rxg3#
- 1...Sf6
- 2.Rxg3#
- 1...Sg7
- 2.Rxg3#
- 1...a5
- 2.Bb5#
- 1...d5
- 2.Qxa6#
- 1...Qf5+
- 1.Sd4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- Q(d);N_SPINQ(d),OGATE,XQ(G)::B(H),XQ(d)
- S(a);N_GUARD::R1(C),XS(a)
- S(a);N_GUARD::R1(C)
- S(a);N_GUARD,XP(E)::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Tries
- Try
- K(I);P-FLIGHT
- Vars
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Refutation
- Q(d);CHECK,N_SPINQ(d),XQ(G)
- Try
- K(I);P-FLIGHT
- Vars
- Q(d);CHECK,N_SPINQ(d),OGATE,XQ(G)::B(H),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- Q(d);OGATEB::QAB(G),XQ(d)
- S(a);N_GUARD::R1(C),XS(a)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Refutation
- S(e);CHECK
- Try
- B(H);
- Vars
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(e);N_GUARD::S(F)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Refutation
- Q(d);N_SPINQ(d),XQ(G)
- Try
- B(H);
- Threat
- DUALS(2)
- Vars
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(e);N_GUARD::S(F)
- P(g);N_GUARD::S(F)
- Refutation
- Q(d);N_SPINQ(d),XQ(G)
- Try
- B(H);
- Vars
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(e);N_GUARD::S(F)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Refutation
- Q(d);N_SPINQ(d),XQ(G)
- Try
- B(H);
- Vars
- Q(d);N_SPINQ(d),OGATE,XQ(G)::B(H),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- Q(d);OGATEB,P_PINB(H)::QAB(G),XQ(d)
- S(a);N_GUARD::R1(C),XS(a)
- S(e);N_GUARD::S(F)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- P(g);N_GUARD::S(F)
- Refutation
- P(f);
- Try
- Q(G);
- Vars
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(e);N_GUARD::S(F)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Refutation
- Q(d);CHECK,N_SPINQ(d),XQ(G)
- Try
- Q(G);
- Vars
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(e);N_GUARD::S(F)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::S(F),XS(e)
- P(f);N_GUARD::B(H)
- P(g);N_GUARD::S(F)
- Refutation
- Q(d);N_SPINQ(d),XQ(G)
- Try
- Q(G);CHECK,N_PINQ(d),XP(c)
- Vars
- Q(d);CHECK,N_GUARD,P_SPINQ(d)::QAR2(G),XQ(d)
- Refutation
- S(e);XQ(G)
- Try
- Actual
- S(F);
- Vars
- Q(d);CHECK,OGATEB::QAB(G),XQ(d)
- Q(d);N_SPINQ(d),OGATE,XQ(G)::B(H),XQ(d)
- S(a);N_GUARD,XP(E)::R1(C)
- S(a);N_GUARD::R1(C),XS(a)
- S(a);N_GUARD::R1(C)
- S(e);N_GUARD::R(C),XP(c)
- P(f);N_GUARD::B(H)
- P(g);OGATE::QAB(G),XP(f)
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).