MESON Chess Problem Database
Problem Display
PID: 177854 (1B5b/4P2B/pQ3p2/r2pNnp1/2qR2P1/n1RpkNp1/6P1/5K2 w - - 0 1)
Samilo, Volodimir Grigorovich
Shedey, Sergey Oleksandrovich
Sahs (Latvia), 1983
#2
11 + 12
| 6490 | yacpdb | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Qa2
- 2.Rcxd3#
- 1...Qa4
- 2.Rcxd3#
- 1...Qb4
- 2.Rcxd3#
- 1...Qc5
- 2.Rcxd3#
- 1...Qc6
- 2.Rcxd3#
- 1...Qc7
- 2.Rcxd3#
- 1...Qc8
- 2.Rcxd3#
- 1...Sh4
- 2.Re4#
- 1...Sd6
- 2.Re4#
- 1...Sh6
- 2.Re4#
- 1...Sxe7
- 2.Re4#
- 1...Sg7
- 2.Re4#
- 1...Qa2
- Tries
- 1.Sxc4+?
- 1...Sxc4
- 2.Rcxd3#
- 1...dxc4!
- 1...Sxc4
- 1.Sd7?
- threat
- 2.Qe6#
- 1...Sxd4
- 2.e8Q#
- 2.e8R#
- 1...Qc6
- 2.Rcxd3#
- 1...Qc7
- 2.Rcxd3#
- 1...Sd6
- 2.Re4#
- 1...Sg7
- 2.Rdxd3#
- 2.Re4#
- 1...Qxd4!
- threat
- 1.Sf7?
- threat
- 2.Qe6#
- 1...Sxd4
- 2.e8Q#
- 2.e8R#
- 1...Qc6
- 2.Rcxd3#
- 1...Qc7
- 2.Rcxd3#
- 1...Qc8
- 2.Rcxd3#
- 1...Sd6
- 2.Re4#
- 1...Sg7
- 2.Rdxd3#
- 2.Re4#
- 1...Qxd4!
- threat
- 1.Bxf5?
- threat
- 2.Re4#
- 1...Qxd4
- 2.Qxd4#
- 1...Qc5
- 2.Rcxd3#
- 1...Rc5!
- threat
- 1.Rdxd3+?
- 1...Ke4
- 2.Qe3#
- 1...Kf4!
- 1...Ke4
- 1.Rdxc4+?
- 1...Rc5
- 2.Rxd3#
- 1...Sd4
- 2.Qxd4#
- 1...d4!
- 1...Rc5
- 1.Qe6?
- threat
- 2.Sxd3#
- 2.Sxc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 1...Qxc3
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 1...Qxd4
- 2.Sc4#
- 1...Sxd4
- 2.Sxc4#
- 1...Qa2
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Rcxd3#
- 1...Qb3
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 1...Qb5
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 1...Qa4
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Rcxd3#
- 1...Qb4
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Rcxd3#
- 1...Qc5
- 2.Sxd3#
- 2.Sc4#
- 2.Sc6#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Rcxd3#
- 1...Qc6
- 2.Sc4#
- 2.Sxc6#
- 2.Rcxd3#
- 1...Qc7
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc8
- 2.Sc4#
- 2.Sd7#
- 2.Rcxd3#
- 1...Sd6
- 2.Sxc4#
- 1...Sg7
- 2.Sxc4#
- 1...fxe5!
- threat
- 1.gxf5?
- threat
- 2.Sg4#
- 1...Qxd4
- 2.Qxd4#
- 1...g4
- 2.Sxg4#
- 1...fxe5!
- threat
- 1.e8Q?
- threat
- 2.Sxc4#
- 1...Qxc3
- 2.Sc4#
- 1...Qxd4
- 2.Sc4#
- 1...Qa2
- 2.Sc4#
- 2.Rcxd3#
- 1...Qb3
- 2.Sc4#
- 1...Qb5
- 2.Sc4#
- 1...Qa4
- 2.Sc4#
- 2.Rcxd3#
- 1...Qb4
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc5
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc6
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc7
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc8
- 2.Sc4#
- 2.Rcxd3#
- 1...Se7
- 2.Re4#
- 1...fxe5!
- threat
- 1.e8R?
- threat
- 2.Sxc4#
- 1...Qxc3
- 2.Sc4#
- 1...Qxd4
- 2.Sc4#
- 1...Qa2
- 2.Sc4#
- 2.Rcxd3#
- 1...Qb3
- 2.Sc4#
- 1...Qb5
- 2.Sc4#
- 1...Qa4
- 2.Sc4#
- 2.Rcxd3#
- 1...Qb4
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc5
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc6
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc7
- 2.Sc4#
- 2.Rcxd3#
- 1...Qc8
- 2.Sc4#
- 2.Rcxd3#
- 1...Se7
- 2.Re4#
- 1...fxe5!
- threat
- 1.Sxc4+?
- Keys
- 1.Sxd3!
- threat
- 2.Qe6#
- 1...Qxd3+
- 2.Rcxd3#
- 1...Qxd4
- 2.Sf2#
- 1...Sxd4
- 2.e8Q#
- 2.e8R#
- 1...Qc6
- 2.Sc5#
- 1...Qc7
- 2.Sc5#
- 1...Qc8
- 2.Sc5#
- 1...Sd6
- 2.Re4#
- 1...Sg7
- 2.Re4#
- threat
- 1.Sxd3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 2
- REMOVED MATES = 7
- Sets
- Q(e);N_GUARD::R1(C),XP(b)
- S(h);::QAB(H)+R(E),DCHECK
- S(h);XP(I)::QAB(H)+R(E),DCHECK
- Tries
- Try
- S(G);CHECK,XQ(e)
- Vars
- S(a);XS(G)::R1(C),XP(b)
- Refutation
- P(g);XS(G)
- Try
- S(G);
- Threat
- QAR(H)
- Vars
- S(h);N_GUARD,P_SPINS(h),XR(E)::P=Q
- Q(e);N_GUARD::R1(C),XP(b)
- S(h);::QAB(H)+R(E),DCHECK
- Refutation
- Q(e);P_SPINQ(e),XR(E)
- Try
- S(G);
- Threat
- QAR(H)
- Vars
- S(h);N_GUARD,P_SPINS(h),XR(E)::P=Q
- Q(e);N_GUARD::R1(C),XP(b)
- S(h);::QAB(H)+R(E),DCHECK
- Refutation
- Q(e);P_SPINQ(e),XR(E)
- Try
- B(J);XS(h)
- Threat
- QAB(H)+R(E),DCHECK
- Vars
- Q(e);OGATE,P_SPINQ(e),XR(E)::QAB1(H),XQ(e)
- Q(e);N_GUARD::R1(C),XP(b)
- Refutation
- R(f);
- Try
- R(E);CHECK,P_SPINR(E),XP(b)
- Vars
- K(c);P-FLIGHT,P_SPINS(h)::QAR1(H)
- Refutation
- K(c);S_FLIGHT
- Try
- R(E);CHECK,XQ(e)
- Vars
- R(f);P_SPINR(f)::R1(C),XP(b)
- S(h);N_GUARD,P_SPINS(h)::QAB1(H),XS(h)
- Refutation
- P(g);
- Try
- Q(H);
- Threat
- DUALS(6)
- Vars
- Q(e);XR(E)::QAR(H)+S(G),DCHECK
- S(h);XR(E)::QAR(H)+S(G),DCHECK,XQ(e)
- S(h);::QAR(H)+S(G),DCHECK,XQ(e)
- Refutation
- P(k);XS(G)
- Try
- P(F);XS(h)
- Threat
- S(G)
- Vars
- Q(e);OGATE,P_SPINQ(e),XR(E)::QAB1(H),XQ(e)
- P(i);::S(G),XP(i)
- Refutation
- P(k);XS(G)
- Try
- P(I);
- Threat
- QAR(I)+S(G),DCHECK,XQ(e)
- Vars
- Q(e);N_SPINP(b),XR(C)::QAR(I)+S(G),DCHECK
- Q(e);P_SPINQ(e),XR(E)::QAR(I)+S(G),DCHECK
- Q(e);::QAR(I)+S(G),DCHECK
- S(h);::QAB(H)+R(E),DCHECK
- Refutation
- P(k);XS(G)
- Try
- P(I);
- Threat
- R(I)+S(G),DCHECK,XQ(e)
- Vars
- Q(e);N_SPINP(b),XR(C)::R(I)+S(G),DCHECK
- Q(e);P_SPINQ(e),XR(E)::R(I)+S(G),DCHECK
- Q(e);::R(I)+S(G),DCHECK
- S(h);::QAB(H)+R(E),DCHECK
- Refutation
- P(k);XS(G)
- Try
- Actual
- S(G);P_SPINS(G),XP(b)
- Threat
- QAR(H)
- Vars
- Q(e);CHECK,OGATE,P_SPINQ(e),XS(G)::R1(C),XQ(e)
- Q(e);N_PINS(G),P_SPINQ(e),XR(E)::R(C)+S(G)
- S(h);N_GUARD,P_SPINS(h),XR(E)::P=Q
- Q(e);N_PINS(G)::R(C)+S(G)
- S(h);::QAB(H)+R(E),DCHECK
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).