MESON Chess Problem Database
Problem Display
PID: 246459 (3R4/n1P5/3B4/N1Pp1P2/pK1kBp2/3pp1n1/pP1NPR2/6Q1 w - - 0 1)
Segers, Marcel
Europe Echecs, 1989
#2
13 + 9
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Sf1
- 2.Qg7#
- 1...Sh1
- 2.Qg7#
- 1...Sxe2
- 2.Qg7#
- 1...Sxe4
- 2.Sf3#
- 1...Sb5
- 2.Sc6#
- 1...Sc6+
- 2.Sxc6#
- 1...Sc8
- 2.Sc6#
- 1...exd2
- 2.Rxf4#
- 1...exf2
- 2.Qxf2#
- 1...a3
- 2.Sab3#
- 1...dxe4
- 2.Bxf4#
- 1...Sf1
- Tries
- 1.Sdb3+?
- 1...Kxe4
- 2.Rxf4#
- 1...axb3!
- 1...Kxe4
- 1.Sac4?
- threat
- 2.Be5#
- 1...exd2
- 2.Rxf4#
- 1...dxc4
- 2.Bxf4#
- 1...Sc6+!
- threat
- 1.Bxd3?
- threat
- 2.Sf3#
- 1...Sc6+
- 2.Sxc6#
- 1...exd2
- 2.Rf1#
- 2.Rg2#
- 2.Rh2#
- 2.Rf3#
- 2.Rxf4#
- 1...exf2
- 2.Qxf2#
- 1...f3
- 2.Sxf3#
- 1...Sxe2!
- threat
- 1.Bxf4?
- threat
- 2.Rxd5#
- 1...Sc6+
- 2.Sxc6#
- 1...Sxe4
- 2.Sf3#
- 1...exd2!
- threat
- 1.Rxf4?
- threat
- 2.Sf3#
- 1...Sc6+
- 2.Sxc6#
- 1...dxe4!
- threat
- 1.Re8?
- threat
- 2.Sf3#
- 2.Be5#
- 1...Sc6+
- 2.Sxc6#
- 1...exd2
- 2.Rf1#
- 2.Rg2#
- 2.Rh2#
- 2.Rf3#
- 2.Rxf4#
- 1...exf2
- 2.Qxf2#
- 1...f3
- 2.Sxf3#
- 2.Be5#
- 1...dxe4!
- threat
- 1.Qxg3?
- threat
- 2.Qg7#
- 1...Sc6+
- 2.Sxc6#
- 1...exd2
- 2.Qxd3#
- 1...exf2
- 2.Qxf2#
- 2.Qxd3#
- 1...dxe4
- 2.Bxf4#
- 1...fxg3!
- threat
- 1.exd3?
- threat
- 2.Sf3#
- 1...Sc6+
- 2.Sxc6#
- 1...exd2
- 2.Rf1#
- 2.Rxd2#
- 2.Re2#
- 2.Rg2#
- 2.Rh2#
- 2.Rf3#
- 2.Rxf4#
- 1...exf2
- 2.Qxf2#
- 1...dxe4
- 2.Bxf4#
- 1...e2
- 2.Rf1#
- 2.Rxe2#
- 2.Rg2#
- 2.Rh2#
- 2.Rf3#
- 2.Rxf4#
- 1...f3
- 2.Sxf3#
- 1...Sxe4!
- threat
- 1.Sdb3+?
- Keys
- 1.b3!
- threat
- 2.Qa1#
- 1...Sc6+
- 2.Sxc6#
- 1...Sxe2
- 2.Qg7#
- 1...Sxe4
- 2.Sf3#
- 1...exd2
- 2.Rxf4#
- 1...exf2
- 2.Qxf2#
- 1...axb3
- 2.Saxb3#
- 1...dxe4
- 2.Bxf4#
- 1...a1Q
- 2.Qxa1#
- 1...a1S
- 2.Qxa1#
- 1...a1B
- 2.Qxa1#
- 1...a1R
- 2.Qxa1#
- 1...Sf1
- 2.Qg7#
- 1...Sb5
- 2.Sc6#
- threat
- 1.b3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 3
- Sets
- S(d);OGATE::QAB(A)
- S(d);OGATE,XP(D)::QAB(A)
- S(d);SBLOCK,XB(G)::S(C)
- S(i);N_GUARD::S(H)
- S(i);CHECK,N_GUARD::S(H),XS(i)
- P(c);OGATEB,XS(C)::QAB(A)+R(E),XP(g)
- P(c);OGATE,P_SPINP(c),XR(E)::QAB(A),XP(c)
- P(e);N_GUARD::S(H)
- P(h);OGATEB,XB(G)::R(M)+B(K),XP(g)
- Tries
- Try
- S(C);CHECK
- Vars
- K(f);P-FLIGHT,XB(G)::R1(E),XP(g)
- Refutation
- P(e);XS(C)
- Try
- S(H);
- Threat
- B(K)
- Vars
- P(c);OGATEB,XS(C)::QAB(A)+R(E),XP(g)
- P(h);OGATEB,XS(H)::R(M)+B(K),XP(g)
- Refutation
- S(i);CHECK
- Try
- B(G);XP(b)
- Threat
- S(C)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- P(c);OGATE,P_SPINP(c),XR(E)::QAB(A),XP(c)
- P(g);::S(C),XP(g)
- Refutation
- S(d);XP(D)
- Try
- B(K);P_PINP(h),XP(g)
- Threat
- R1(M),XP(h)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- S(d);SBLOCK,XB(G)::S(C)
- Refutation
- P(c);XS(C)
- Try
- R(E);P_PINP(c),XP(g)
- Threat
- S(C)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- Refutation
- P(h);XB(G)
- Try
- R(M);
- Threat
- DUALS(2)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- P(c);OGATE,P_SPINP(c),XR(E)::QAB(A),XP(c)
- Refutation
- P(h);XB(G)
- Try
- Q(A);XS(d)
- Threat
- QAB(A)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- P(c);OGATE,XS(C)::QAR1(A),XP(b)
- P(h);OGATEB,XB(G)::R(M)+B(K),XP(g)
- Refutation
- P(g);XQ(A)
- Try
- P(D);XP(b)
- Threat
- S(C)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- P(c);OGATE,P_SPINP(c),XR(E)::QAB(A),XP(c)
- P(h);OGATEB,XB(G)::R(M)+B(K),XP(g)
- P(g);::S(C),XP(g)
- Refutation
- S(d);XB(G)
- Try
- Actual
- P(B);
- Threat
- QAB(A)
- Vars
- S(i);CHECK,N_GUARD::S(H),XS(i)
- S(d);OGATE,XP(D)::QAB(A)
- S(d);SBLOCK,XB(G)::S(C)
- P(c);OGATEB,XS(C)::QAB(A)+R(E),XP(g)
- P(c);OGATE,P_SPINP(c),XR(E)::QAB(A),XP(c)
- P(e);XP(B)::S(H),XP(e)
- P(h);OGATEB,XB(G)::R(M)+B(K),XP(g)
- P(a);::QAB(A),XQ(a)
- P(a);::QAB(A),XS(a)
- P(a);::QAB(A),XB(a)
- P(a);::QAB(A),XR(a)
- S(d);OGATE::QAB(A)
- S(i);N_GUARD::S(H)
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).