MESON Chess Problem Database
Problem Display
PID: 64478 (2b1R1qb/4B3/1N1r1r1N/5n2/2P1B3/3Pk1p1/2P5/Q3KRn1 w - - 0 1)
Ellerman, Arnoldo
Chess, 1947
#2
11 + 9
SOLUTION
- SOUND
- Sets
- 1...Qxc4
- 2.Sxc4#
- 2.Sg4#
- 1...Qd5
- 2.Sg4#
- 1...Qe6
- 2.Sg4#
- 1...Qf7
- 2.Sg4#
- 1...Qh7
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Qxe8
- 2.Sg4#
- 1...Qf8
- 2.Sg4#
- 1...Rd4
- 2.Qc1#
- 1...Rde6
- 2.Sd5#
- 1...Rfe6
- 2.Sxf5#
- 1...Bg7
- 2.Sg4#
- 1...Se2
- 2.Rf3#
- 1...Sf3+
- 2.Rxf3#
- 1...Sh3
- 2.Rf3#
- 1...Sd4
- 2.Qc1#
- 1...Qxc4
- Tries
- 1.Sd5+?
- 1...Qxd5
- 2.Sg4#
- 1...Rxd5!
- 1...Qxd5
- 1.Bh1?
- threat
- 2.Qe5#
- 1...Sf3+
- 2.Rxf3#
- 1...Qxc4
- 2.Sxc4#
- 1...Rxh6
- 2.Bg5#
- 1...Qd5
- 2.Sg4#
- 1...Qe6
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Rd4
- 2.Qc1#
- 1...Rd5
- 2.Bc5#
- 1...Rde6
- 2.Sd5#
- 1...Rfe6
- 2.Sxf5#
- 1...Rg6
- 2.Bg5#
- 1...Rf7
- 2.Bg5#
- 1...Rf8
- 2.Bg5#
- 1...Sd4
- 2.Qc1#
- 1...Bb7!
- threat
- 1.Bg2?
- threat
- 2.Qe5#
- 1...Sf3+
- 2.Rxf3#
- 1...Qxc4
- 2.Sxc4#
- 1...Rxh6
- 2.Bg5#
- 1...Qd5
- 2.Sg4#
- 1...Qe6
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Rd4
- 2.Qc1#
- 1...Rd5
- 2.Bc5#
- 1...Rde6
- 2.Sd5#
- 1...Rfe6
- 2.Sxf5#
- 1...Rg6
- 2.Bg5#
- 1...Rf7
- 2.Bg5#
- 1...Rf8
- 2.Bg5#
- 1...Sd4
- 2.Qc1#
- 1...Bb7!
- threat
- 1.Bd5?
- threat
- 2.Qe5#
- 1...Sf3+
- 2.Rxf3#
- 1...Qxd5
- 2.Sg4#
- 1...Rxd5
- 2.Bc5#
- 1...Rxh6
- 2.Bg5#
- 1...Qe6
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Rfe6
- 2.Sxf5#
- 1...Rg6
- 2.Bg5#
- 1...Rf7
- 2.Bg5#
- 1...Rf8
- 2.Bg5#
- 1...Sd4
- 2.Qc1#
- 1...Rde6!
- threat
- 1.Bb7?
- threat
- 2.Qe5#
- 1...Sf3+
- 2.Rxf3#
- 1...Qxc4
- 2.Sxc4#
- 1...Rxh6
- 2.Bg5#
- 1...Qd5
- 2.Sg4#
- 1...Qe6
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Rd4
- 2.Qc1#
- 1...Rd5
- 2.Bc5#
- 1...Rde6
- 2.Sd5#
- 1...Rfe6
- 2.Sxf5#
- 1...Rg6
- 2.Bg5#
- 1...Rf7
- 2.Bg5#
- 1...Rf8
- 2.Bg5#
- 1...Sd4
- 2.Qc1#
- 1...Bxb7!
- threat
- 1.Ba8?
- threat
- 2.Qe5#
- 1...Sf3+
- 2.Rxf3#
- 1...Qxc4
- 2.Sxc4#
- 1...Rxh6
- 2.Bg5#
- 1...Qd5
- 2.Sg4#
- 1...Qe6
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Rd4
- 2.Qc1#
- 1...Rd5
- 2.Bc5#
- 1...Rde6
- 2.Sd5#
- 1...Rfe6
- 2.Sxf5#
- 1...Rg6
- 2.Bg5#
- 1...Rf7
- 2.Bg5#
- 1...Rf8
- 2.Bg5#
- 1...Sd4
- 2.Qc1#
- 1...Bb7!
- threat
- 1.c3?
- threat
- 2.Qc1#
- 1...Sf3+
- 2.Rxf3#
- 1...Se2
- 2.Rf3#
- 1...Rxd3!
- threat
- 1.Sd5+?
- Keys
- 1.Bc6!
- threat
- 2.Qe5#
- 1...Sf3+
- 2.Rxf3#
- 1...Qxc4
- 2.Sxc4#
- 1...Rxh6
- 2.Bg5#
- 1...Qd5
- 2.Sg4#
- 1...Qe6
- 2.Sg4#
- 1...Qg4
- 2.Sxg4#
- 1...Rd4
- 2.Qc1#
- 1...Rd5
- 2.Bc5#
- 1...Rde6
- 2.Sd5#
- 1...Rfe6
- 2.Sxf5#
- 1...Rg6
- 2.Bg5#
- 1...Rf7
- 2.Bg5#
- 1...Rf8
- 2.Bg5#
- 1...Sd4
- 2.Qc1#
- threat
- 1.Bc6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 7
- Sets
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- Q(h);N_GUARD,XR(K)::S(I)
- R(e);SBLOCK::QAB(A)
- R(e);N_GUARD,S_CUTQ(h)::S(H)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- B(i);S_CUTQ(h)::S(I)
- S(a);N_GUARD::R1(C)
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- S(d);SBLOCK::QAB(A)
- Tries
- Try
- S(H);CHECK
- Vars
- Q(h);XS(H)::S(I)
- Refutation
- R(e);XS(H)
- Try
- B(G);
- Threat
- QAR2(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- Q(h);XP(F)::S(H),XQ(h)
- R(f);OGATE,XS(I)::R(K)+B(J),DCHECK
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- R(e);SBLOCK::QAB(A)
- R(e);OGATE::R(K)+B(J),DCHECK
- R(e);N_GUARD,S_CUTQ(h)::S(H)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- R(f);OGATE::R(K)+B(J),DCHECK
- S(d);SBLOCK::QAB(A)
- Refutation
- B(g);
- Try
- B(G);
- Threat
- QAR2(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- Q(h);XP(F)::S(H),XQ(h)
- R(f);OGATE,XS(I)::R(K)+B(J),DCHECK
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- R(e);SBLOCK::QAB(A)
- R(e);OGATE::R(K)+B(J),DCHECK
- R(e);N_GUARD,S_CUTQ(h)::S(H)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- R(f);OGATE::R(K)+B(J),DCHECK
- S(d);SBLOCK::QAB(A)
- Refutation
- B(g);
- Try
- B(G);
- Threat
- QAR2(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- Q(h);N_GUARD,XB(G)::S(I)
- R(e);OGATE,XB(G)::R(K)+B(J),DCHECK
- R(f);OGATE,XS(I)::R(K)+B(J),DCHECK
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- R(f);OGATE::R(K)+B(J),DCHECK
- S(d);SBLOCK::QAB(A)
- Refutation
- R(e);
- Try
- B(G);
- Threat
- QAR2(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- Q(h);XP(F)::S(H),XQ(h)
- R(f);OGATE,XS(I)::R(K)+B(J),DCHECK
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- R(e);SBLOCK::QAB(A)
- R(e);OGATE::R(K)+B(J),DCHECK
- R(e);N_GUARD,S_CUTQ(h)::S(H)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- R(f);OGATE::R(K)+B(J),DCHECK
- S(d);SBLOCK::QAB(A)
- Refutation
- B(g);XB(G)
- Try
- B(G);
- Threat
- QAR2(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- Q(h);XP(F)::S(H),XQ(h)
- R(f);OGATE,XS(I)::R(K)+B(J),DCHECK
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- R(e);SBLOCK::QAB(A)
- R(e);OGATE::R(K)+B(J),DCHECK
- R(e);N_GUARD,S_CUTQ(h)::S(H)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- R(f);OGATE::R(K)+B(J),DCHECK
- S(d);SBLOCK::QAB(A)
- Refutation
- B(g);
- Try
- P(D);
- Threat
- QAB(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- S(a);N_GUARD::R1(C)
- Refutation
- R(e);XP(E)
- Try
- Actual
- B(G);
- Threat
- QAR2(A)
- Vars
- S(a);CHECK,N_GUARD::R1(C),XS(a)
- Q(h);XP(F)::S(H),XQ(h)
- R(f);OGATE,XS(I)::R(K)+B(J),DCHECK
- Q(h);N_GUARD::S(I)
- Q(h);N_GUARD::S(I),XQ(h)
- R(e);SBLOCK::QAB(A)
- R(e);OGATE::R(K)+B(J),DCHECK
- R(e);N_GUARD,S_CUTQ(h)::S(H)
- R(f);N_GUARD,S_CUTB(g)::S(I),XS(d)
- R(f);OGATE::R(K)+B(J),DCHECK
- S(d);SBLOCK::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).