MESON Chess Problem Database
Problem Display
PID: 27203 (8/8/8/8/K3N1Qq/7p/4NPPk/6R1 w - - 0 1)
Lebeck, Donald
Mate in Two!! (Lebeck), 1992
#2
7 + 3
SOLUTION
- SOUND
- Sets
- 1...Qxf2
- 2.Qxh3#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...hxg2
- 2.Qxg2#
- 2.Qxh4#
- 1...Qxf2
- Tries
- 1.Kb3?
- 1...Qg3+
- 2.Qxg3#
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxg2#
- 2.Qxh4#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...Qxg4!
- 1...Qg3+
- 1.Sd2?
- threat
- 2.Sf1#
- 2.Sf3#
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Sf3#
- 2.Qxh4#
- 1...Qg3
- 2.Sf1#
- 2.Qxg3#
- 1...Qf6
- 2.Sf1#
- 2.Qxh3#
- 2.Qg3#
- 1...Qxg4+!
- threat
- 1.S4c3?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...Qxg4+!
- 1...Qxf2
- 1.S4g3?
- threat
- 2.Sf1#
- 1...Qxg3
- 2.Qxg3#
- 1...hxg2
- 2.Qxh4#
- 1...Qxg4+!
- threat
- 1.Sc5?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...Qxg4+!
- 1...Qxf2
- 1.Sg5?
- threat
- 2.Sf3#
- 1...Qxf2
- 2.Qxh3#
- 1...Qxg5
- 2.Qxh3#
- 1...Qg3
- 2.Qxg3#
- 1...Qxg4+!
- threat
- 1.Sd6?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...Qxg4+!
- 1...Qxf2
- 1.Ra1?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...Qxf2
- 1.Rb1?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...Qxf2
- 1.Rc1?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...Qxf2
- 1.Rd1?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...Qxf2
- 1.Re1?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...Qxf2
- 1.Rf1?
- 1...Qxf2
- 2.Qxh3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...Qxf2
- 1.Qf4+?
- 1...Qg3
- 2.Qxg3#
- 1...Qxf4!
- 1...Qg3
- 1.f3?
- 1...hxg2
- 2.Qxg2#
- 2.Qxh4#
- 1...Qe1
- 2.Qxh3#
- 1...Qf2
- 2.Qxh3#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 2.Qf4#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...Qxg4!
- 1...hxg2
- 1.f4?
- 1...hxg2
- 2.Qxg2#
- 2.Qxh4#
- 1...Qe1
- 2.Qxh3#
- 1...Qf2
- 2.Qxh3#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qf6
- 2.Qxh3#
- 2.Qg3#
- 1...Qe7
- 2.Qxh3#
- 2.Qg3#
- 1...Qd8
- 2.Qxh3#
- 2.Qg3#
- 1...Qh5
- 2.Qg3#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 1...Qh8
- 2.Qg3#
- 1...Qxg4!
- 1...hxg2
- 1.Kb3?
- Keys
- 1.Sf6!
- 1...Qxg4+
- 2.Sxg4#
- 1...Qxf2
- 2.Qxh3#
- 1...Qxf6
- 2.Qxh3#
- 2.Qg3#
- 1...hxg2
- 2.Qxh4#
- 1...Qg3
- 2.Qxg3#
- 1...Qg5
- 2.Qxh3#
- 1...Qh5
- 2.Qg3#
- 2.Qf4#
- 1...Qh6
- 2.Qg3#
- 1...Qh7
- 2.Qg3#
- 2.Qf4#
- 1...Qh8
- 2.Qg3#
- 2.Qf4#
- 1...Qxg4+
- 1.Sf6!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Tries
- Try
- K(E);S_FLIGHT
- Vars
- Q(c);CHECK,N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);XQ(G)
- Try
- S(F);P_SPINQ(G)
- Threat
- DUALS(2)
- Vars
- Q(c);N_PINQ(G),XP(C)::QAR1(G),XP(b)
- Refutation
- Q(c);CHECK,XQ(G)
- Try
- S(F);P_SPINQ(G)
- Vars
- Q(c);N_PINQ(G),XP(C)::QAR1(G),XP(b)
- P(b);XP(D)::QAR2(G),XQ(c)
- Q(c);N_PINQ(G)::QAB1(G),XQ(c)
- Q(c);N_PINQ(G)::QAR1(G),XP(b)
- Q(c);N_PINQ(G)::QAB1(G)
- Refutation
- Q(c);CHECK,XQ(G)
- Try
- S(F);P_SPINQ(G)
- Threat
- S(F)
- Vars
- Q(c);N_PINQ(G),XS(F)::QAB1(G),XQ(c)
- P(b);XP(D)::QAR2(G),XQ(c)
- Refutation
- Q(c);CHECK,XQ(G)
- Try
- S(F);P_SPINQ(G)
- Vars
- Q(c);N_PINQ(G),XP(C)::QAR1(G),XP(b)
- P(b);XP(D)::QAR2(G),XQ(c)
- Q(c);N_PINQ(G)::QAB1(G),XQ(c)
- Q(c);N_PINQ(G)::QAR1(G),XP(b)
- Q(c);N_PINQ(G)::QAB1(G)
- Refutation
- Q(c);CHECK,XQ(G)
- Try
- S(F);P_SPINQ(G)
- Threat
- S(F)
- Vars
- Q(c);N_PINQ(G),XP(C)::QAR1(G),XP(b)
- Q(c);N_PINQ(G),XS(F)::QAR1(G),XP(b)
- Q(c);N_PINQ(G)::QAB1(G),XQ(c)
- Refutation
- Q(c);CHECK,XQ(G)
- Try
- S(F);P_SPINQ(G)
- Vars
- Q(c);N_PINQ(G),XP(C)::QAR1(G),XP(b)
- P(b);XP(D)::QAR2(G),XQ(c)
- Q(c);N_PINQ(G)::QAB1(G),XQ(c)
- Q(c);N_PINQ(G)::QAR1(G),XP(b)
- Q(c);N_PINQ(G)::QAB1(G)
- Refutation
- Q(c);CHECK,XQ(G)
- Try
- R(A);
- Vars
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- P(b);OGATEB,SBLOCK,XP(D)::QAR2(G),XQ(c)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- R(A);
- Vars
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- P(b);OGATEB,SBLOCK,XP(D)::QAR2(G),XQ(c)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- R(A);
- Vars
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- P(b);OGATEB,SBLOCK,XP(D)::QAR2(G),XQ(c)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- R(A);
- Vars
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- P(b);OGATEB,SBLOCK,XP(D)::QAR2(G),XQ(c)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- R(A);
- Vars
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- P(b);OGATEB,SBLOCK,XP(D)::QAR2(G),XQ(c)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- R(A);
- Vars
- Q(c);N_GUARD,XP(C)::QAR1(G),XP(b)
- P(b);OGATEB,SBLOCK,XP(D)::QAR2(G),XQ(c)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- Q(G);CHECK
- Vars
- Q(c);N_GUARD,P_SPINQ(c)::QAB1(G),XQ(c)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- P(C);
- Vars
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);P_PINS(F),XQ(G)
- Try
- P(C);
- Vars
- Q(c);N_GUARD::QAR1(G),XP(b)
- Q(c);N_GUARD::QAB1(G),XQ(c)
- Q(c);N_GUARD::QAB1(G)
- Refutation
- Q(c);XQ(G)
- Try
- Actual
- S(F);P_SPINQ(G)
- Vars
- Q(c);CHECK,XQ(G)::S(F),XQ(c)
- Q(c);N_PINQ(G),XP(C)::QAR1(G),XP(b)
- P(b);XP(D)::QAR2(G),XQ(c)
- Q(c);N_PINQ(G)::QAB1(G),XQ(c)
- Q(c);N_PINQ(G)::QAR1(G),XP(b)
- Q(c);N_PINQ(G)::QAB1(G)
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).