MESON Chess Problem Database
Problem Display
PID: 147034 (2N3n1/2pp4/1pPPPp2/3k4/pP1p2N1/2R1R2p/7K/3Q1Bn1 w - - 0 1)
Onkoud, Abdelaziz
Australian Chess Problem Magazine, 1995
#2
11 + 10
SOLUTION
- SOUND
- Sets
- 1...Sf3+
- 2.Qxf3#
- 1...Sh6
- 2.Sxf6#
- 1...Se7
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...d3
- 2.Qxd3#
- 1...b5
- 2.Rc5#
- 1...f5
- 2.Re5#
- 1...cxd6
- 2.Sxb6#
- 1...dxc6
- 2.Bc4#
- 1...Sf3+
- Tries
- 1.Kxg1?
- threat
- 2.Qf3#
- 1...d3
- 2.Qxd3#
- 1...h2+!
- threat
- 1.Be2?
- 1...Sf3+
- 2.Bxf3#
- 1...Sxe2
- 2.Qh1#
- 1...cxd6
- 2.Sxb6#
- 1...dxc6
- 2.Bc4#
- 1...d3
- 2.Qxd3#
- 1...Sh6
- 2.Sxf6#
- 1...Se7
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...b5
- 2.Rc5#
- 1...f5
- 2.Re5#
- 1...dxe6!
- 1...Sf3+
- 1.Bg2+?
- 1...Sf3+
- 2.Bxf3#
- 2.Qxf3#
- 1...hxg2!
- 1...Sf3+
- 1.Bb5?
- 1...Sf3+
- 2.Qxf3#
- 1...cxd6
- 2.Sxb6#
- 1...dxc6
- 2.Bc4#
- 2.Bxc6#
- 1...d3
- 2.Rcxd3#
- 2.Qxd3#
- 1...Se2
- 2.Qh1#
- 1...Sh6
- 2.Sxf6#
- 1...Se7
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...f5
- 2.Re5#
- 1...dxe6!
- 1...Sf3+
- 1.Ba6?
- 1...Sf3+
- 2.Qxf3#
- 1...cxd6
- 2.Sxb6#
- 1...dxc6
- 2.Bc4#
- 1...d3
- 2.Qxd3#
- 1...Se2
- 2.Qh1#
- 1...Sh6
- 2.Sxf6#
- 1...Se7
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...b5
- 2.Rc5#
- 1...f5
- 2.Re5#
- 1...dxe6!
- 1...Sf3+
- 1.Rc4?
- threat
- 2.Qxd4#
- 1...Sf3+
- 2.Qxf3#
- 1...d3
- 2.Qxd3#
- 1...Se2!
- threat
- 1.Qe2?
- threat
- 2.Qc4#
- 2.Qb5#
- 2.Qa2#
- 1...Sf3+
- 2.Qxf3#
- 1...dxc3
- 2.Qc4#
- 1...dxe3
- 2.Qc4#
- 1...dxc6
- 2.Qc4#
- 2.Qa2#
- 1...d3
- 2.Rexd3#
- 2.Qxd3#
- 1...b5
- 2.Rc5#
- 2.Qxb5#
- 2.Qa2#
- 1...Sxe2!
- threat
- 1.Qd2?
- threat
- 2.Qa2#
- 1...d3
- 2.Qxd3#
- 1...Sf3+!
- threat
- 1.Qd3?
- threat
- 2.Qc4#
- 2.Qe4#
- 2.Qb5#
- 2.Qf5#
- 1...dxc6
- 2.Qc4#
- 2.Qe4#
- 2.Qf5#
- 1...dxe6
- 2.Qc4#
- 2.Qe4#
- 2.Qb5#
- 1...Sh6
- 2.Sxf6#
- 2.Qc4#
- 2.Qe4#
- 2.Qb5#
- 1...Se7
- 2.Sxf6#
- 2.Qc4#
- 2.Qe4#
- 2.Qb5#
- 1...b5
- 2.Rc5#
- 2.Qe4#
- 2.Qxb5#
- 2.Qf5#
- 1...f5
- 2.Re5#
- 2.Qc4#
- 2.Qb5#
- 2.Qxf5#
- 1...Sf3+!
- threat
- 1.exd7?
- 1...Sf3+
- 2.Qxf3#
- 1...cxd6
- 2.Sxb6#
- 1...d3
- 2.Qxd3#
- 1...Sh6
- 2.Sxf6#
- 1...Se7
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...b5
- 2.Rc5#
- 1...f5
- 2.Re5#
- 1...Se2!
- 1...Sf3+
- 1.e7?
- 1...Sf3+
- 2.Qxf3#
- 1...Sxe7
- 2.Sxf6#
- 1...cxd6
- 2.Sxb6#
- 1...dxc6
- 2.Bc4#
- 1...d3
- 2.Qxd3#
- 1...Sh6
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...b5
- 2.Rc5#
- 1...f5
- 2.Re5#
- 1...Se2!
- 1...Sf3+
- 1.Kxg1?
- Keys
- 1.Bd3!
- 1...Sf3+
- 2.Qxf3#
- 1...dxc3
- 2.Bb5#
- 1...dxe3
- 2.Bf5#
- 1...cxd6
- 2.Sxb6#
- 1...dxc6
- 2.Bc4#
- 1...dxe6
- 2.Be4#
- 1...Se2
- 2.Qh1#
- 1...Sh6
- 2.Sxf6#
- 1...Se7
- 2.Sxf6#
- 1...a3
- 2.Qb3#
- 1...b5
- 2.Rc5#
- 1...f5
- 2.Re5#
- 1...Sf3+
- 1.Bd3!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 1
- Sets
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(d);OGATEB::QAR2(A),XP(d)
- P(f);N_GUARD::R1(D)
- P(g);N_GUARD::R1(E)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- P(i);SBLOCK,XP(H)::B(B)
- Tries
- Try
- K(C);S_FLIGHT,XS(a)
- Threat
- QAB(A)
- Vars
- P(d);OGATEB::QAR2(A),XP(d)
- Refutation
- P(b);CHECK
- Try
- B(B);
- Vars
- S(a);CHECK,N_GUARD::B(B),XS(a)
- S(a);OGATE,XB(B)::QAB(A)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- P(i);SBLOCK,XP(H)::B(B)
- P(d);OGATEB::QAR2(A),XP(d)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(f);N_GUARD::R1(D)
- P(g);N_GUARD::R1(E)
- Refutation
- P(i);XP(J)
- Try
- B(B);CHECK
- Refutation
- P(b);XB(B)
- Try
- B(B);
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- S(a);OGATE::QAB(A)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(g);N_GUARD::R1(E)
- Refutation
- P(i);XP(J)
- Try
- B(B);
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- P(i);SBLOCK,XP(H)::B(B)
- P(d);OGATEB::QAR2(A),XP(d)
- S(a);OGATE::QAB(A)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(f);N_GUARD::R1(D)
- P(g);N_GUARD::R1(E)
- Refutation
- P(i);XP(J)
- Try
- R(D);
- Threat
- QAR1(A),XP(d)
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- P(d);OGATEB::QAR2(A),XP(d)
- Refutation
- S(a);
- Try
- Q(A);N_PINP(d)
- Threat
- DUALS(3)
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- P(d);XR(D)::QAB1(A)
- P(d);XR(E)::QAB1(A)
- Refutation
- S(a);XQ(A)
- Try
- Q(A);
- Threat
- QAB(A)
- Vars
- P(d);OGATEB::QAR2(A),XP(d)
- Refutation
- S(a);CHECK
- Try
- Q(A);
- Threat
- DUALS(4)
- Refutation
- S(a);CHECK
- Try
- P(J);XP(i)
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- P(d);OGATEB::QAR2(A),XP(d)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(f);N_GUARD::R1(D)
- P(g);N_GUARD::R1(E)
- Refutation
- S(a);
- Try
- P(J);
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- S(j);N_GUARD,XP(J)::S(G),XP(g)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- P(i);SBLOCK,XP(H)::B(B)
- P(d);OGATEB::QAR2(A),XP(d)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(f);N_GUARD::R1(D)
- P(g);N_GUARD::R1(E)
- Refutation
- S(a);
- Try
- Actual
- B(B);N_PINP(d)
- Vars
- S(a);CHECK,N_GUARD::QAB(A),XS(a)
- P(d);OGATEB,XR(D)::QAR(A)+B(B)
- P(d);OGATEB,XR(E)::QAR(A)+B(B)
- P(h);N_GUARD,SBLOCK,XP(I)::S(K),XP(f)
- P(i);SBLOCK,XP(H)::B(B)
- P(i);SBLOCK,XP(J)::B(B)
- S(a);OGATE::QAB(A)
- S(j);N_GUARD::S(G),XP(g)
- P(c);N_GUARD::QAB(A)
- P(f);N_GUARD::R1(D)
- P(g);N_GUARD::R1(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).