MESON Chess Problem Database
Problem Display
PID: 58136 (5nqn/3p3p/3P3P/8/2PPBk1P/R1p1NP2/2K1Q2P/8 w - - 0 1)
Fox, Matthew
Chess Life, 1958
#2
12 + 7
SOLUTION
- SOUND
- Sets
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qxc4
- Tries
- 1.Bd3?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Ra1?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Ra2?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Rb3?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Rxc3?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Ra4?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Ra5?
- threat
- 2.Rf5#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg5!
- threat
- 1.Ra6?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Ra7?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Ra8?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Qd1?
- 1...Qg2+
- 2.Sxg2#
- 1...Kxe3
- 2.Qd2#
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qg2+
- 1.Qd3?
- 1...Qg2+
- 2.Sxg2#
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qg2+
- 1.Qe1?
- 1...Qg2+
- 2.Sxg2#
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 2.hxg3#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qg2+
- 1.Qd2?
- threat
- 2.Sg2#
- 2.Sd5#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...cxd2!
- threat
- 1.Qf2?
- 1...Qxc4
- 2.Sg2#
- 1...Qd5
- 2.Sg2#
- 2.Sxd5#
- 1...Qe6
- 2.Sg2#
- 1...Qf7
- 2.Sg2#
- 1...Qg1
- 2.Sd5#
- 1...Qg2
- 2.Sxg2#
- 2.Sd5#
- 1...Qg3
- 2.Sd5#
- 2.hxg3#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Sg2#
- 1...Shg6
- 2.Sg2#
- 1...Sf7
- 2.Sd5#
- 1...Qg5!
- 1...Qxc4
- 1.Bd3?
- Keys
- 1.Qg2!
- 1...Qxg2+
- 2.Sxg2#
- 1...Kxe3
- 2.Qd2#
- 1...Qxc4
- 2.Qg5#
- 1...Qg5
- 2.Qxg5#
- 1...Qd5
- 2.Sxd5#
- 1...Qe6
- 2.Qg5#
- 1...Qf7
- 2.Qg5#
- 1...Qg3
- 2.Sd5#
- 1...Qg4
- 2.Sd5#
- 1...Qg6
- 2.Sd5#
- 1...Qg7
- 2.Sd5#
- 1...Se6
- 2.Sd5#
- 1...Sfg6
- 2.Qg5#
- 1...Shg6
- 2.Qg5#
- 1...Sf7
- 2.Sd5#
- 1...Qxg2+
- 1.Qg2!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 5
- ADDED MATES = 4
- REMOVED MATES = 1
- Sets
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Tries
- Try
- B(I);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);XP(a)
- Vars
- Q(f);N_GUARD,P_PINR(D),XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Threat
- R1(D)
- Vars
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- R(D);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- Q(B);
- Vars
- Q(f);CHECK,N_GUARD::S(E),XQ(f)
- K(b);OGATEB,P_SPINP(a),S_FLIGHT,XS(E)::QAB1(B)
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- Q(B);
- Vars
- Q(f);CHECK,N_GUARD::S(E),XQ(f)
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- Q(B);
- Vars
- Q(f);CHECK,N_GUARD::S(E),XQ(f)
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- Q(B);
- Threat
- DUALS(2)
- Refutation
- P(a);XQ(B)
- Try
- Q(B);
- Vars
- Q(f);N_GUARD,XP(G)::S(E)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(g);S_CUTQ(f)::S(E)
- Refutation
- Q(f);
- Try
- Actual
- Q(B);
- Vars
- Q(f);CHECK,XQ(B)::S(E),XQ(f)
- K(b);OGATEB,P_SPINP(a),S_FLIGHT,XS(E)::QAB1(B)
- Q(f);N_GUARD,XP(G)::QAB1(B)
- Q(f);N_GUARD::QAB1(B),XQ(f)
- Q(f);N_GUARD::S(E),XQ(f)
- Q(f);N_GUARD::QAB1(B)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD,P_PINB(I)::S(E)
- S(e);S_CUTQ(f)::S(E)
- S(e);S_CUTQ(f)::QAB1(B)
- S(g);S_CUTQ(f)::QAB1(B)
- S(g);S_CUTQ(f)::S(E)
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).