MESON Chess Problem Database
Problem Display
PID: 255119 (3Kn2b/1B3p2/1R1Nkp2/3Nr1p1/4p3/3P4/8/4Qb2 w - - 0 1)
Lukyanov, Valentin Volodimirovich
Sp. Prize, Leninskaya Smena, 1981
#2
7 + 9
| 15601 | Albrecht-Leiss-Degener Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...g4
- 2.Sf4#
- 1...f5
- 2.Sxe8#
- 1...Sc7
- Tries
- 1.Kxe8?
- threat
- 2.Sc7#
- 1...Rf5
- 2.Sc4#
- 2.Sxf7#
- 1...f5
- 2.Sc4#
- 2.Sxe4#
- 2.Sb5#
- 2.Sxf7#
- 2.Sc8#
- 1...Rxd5!
- threat
- 1.Sb5+?
- 1...Sd6
- 2.Sd4#
- 1...Kf5!
- 1...Sd6
- 1.Sf5+?
- 1...Sd6
- 2.Sd4#
- 1...Kxf5!
- 1...Sd6
- 1.Qf2?
- threat
- 2.Sxe8#
- 1...Sxd6
- 2.Sc7#
- 1...Rf5
- 2.Qxf5#
- 1...Sc7
- 2.Sxc7#
- 2.Sc4#
- 2.Sxe4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 1...Sg7
- 2.Sc7#
- 2.Sc4#
- 2.Sxe4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 2.Qxf6#
- 1...Rxd5!
- threat
- 1.Qa5?
- threat
- 2.Bc8#
- 1...Rxd5
- 2.Qxd5#
- 1...Rf5!
- threat
- 1.Qxf1?
- threat
- 2.Sxe8#
- 1...Sxd6
- 2.Sc7#
- 1...Rf5
- 2.Qxf5#
- 1...Sc7
- 2.Sxc7#
- 2.Sc4#
- 2.Sxe4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 1...Sg7
- 2.Sc7#
- 2.Sc4#
- 2.Sxe4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 2.Qxf6#
- 1...Rxd5!
- threat
- 1.Qxe4?
- threat
- 2.Sxe8#
- 2.Bc8#
- 1...Sxd6
- 2.Sc7#
- 2.Bc8#
- 1...Sc7
- 2.Sxc7#
- 2.Sc4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 2.Bc8#
- 1...Sg7
- 2.Sc7#
- 2.Sc4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 2.Bc8#
- 1...Rxe4!
- threat
- 1.dxe4?
- threat
- 2.Sxe8#
- 2.Bc8#
- 1...Rxe4
- 2.Qxe4#
- 1...Rxd5
- 2.exd5#
- 1...Sxd6
- 2.Sc7#
- 2.Bc8#
- 1...Rf5
- 2.exf5#
- 1...Ba6
- 2.Sxe8#
- 1...Sc7
- 2.Sxc7#
- 2.Sc4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 2.Bc8#
- 1...Sg7
- 2.Sc7#
- 2.Sc4#
- 2.Sb5#
- 2.Sf5#
- 2.Sc8#
- 2.Se8#
- 2.Bc8#
- 1...Bb5!
- threat
- 1.Kxe8?
- Keys
- 1.Qc3!
- threat
- 2.Qc8#
- 1...Rxd5
- 2.Bc8#
- 1...Rf5
- 2.Sxe8#
- 1...Sc7
- 2.Sxc7#
- threat
- 1.Qc3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 3
- Sets
- S(h);N_GUARD::S(C),XS(h)
- S(h);N_GUARD::S(C)
- P(d);N_GUARD::S(C)
- P(f);SBLOCK::R(D)+S(E),XS(h)
- Tries
- Try
- K(G);P-FLIGHT,XS(h)
- Threat
- S(C)
- Refutation
- R(c);P_SPINP(b),XS(C)
- Try
- S(E);CHECK
- Vars
- S(h);P_SPINS(h)::S(E)
- Refutation
- K(e);S_FLIGHT
- Try
- S(E);CHECK
- Vars
- S(h);P_SPINS(h)::S(E)
- Refutation
- K(e);S_FLIGHT,XS(E)
- Try
- Q(A);
- Threat
- R(D)+S(E),XS(h)
- Vars
- S(h);N_GUARD,P_SPINS(h),XS(E)::S(C)
- R(c);N_GUARD::QAB1(A),XR(c)
- Refutation
- R(c);P_PINS(E),XS(C)
- Try
- Q(A);
- Threat
- B(F)
- Vars
- R(c);OGATE,P_PINS(E),XS(C)::QAB1(A),XR(c)
- Refutation
- R(c);
- Try
- Q(A);XB(a)
- Threat
- R(D)+S(E),XS(h)
- Vars
- S(h);N_GUARD,P_SPINS(h),XS(E)::S(C)
- R(c);N_GUARD::QAB1(A),XR(c)
- Refutation
- R(c);P_PINS(E),XS(C)
- Try
- Q(A);P_PINR(c),XP(b)
- Threat
- DUALS(2)
- Refutation
- R(c);N_SPINR(c),XQ(A)
- Try
- P(B);XP(b)
- Threat
- DUALS(2)
- Vars
- R(c);OGATE,P_SPINR(c),XP(B)::QAR2(A),XR(c)
- R(c);OGATE,P_PINS(E),XS(C)::QAR(A)+P(B)DCHECK,XR(c)
- R(c);OGATE::QAR(A)+P(B)DCHECK,XR(c)
- B(a);::R(D)+S(E),XS(h)
- Refutation
- B(a);
- Try
- Actual
- Q(A);
- Threat
- QAB(A)
- Vars
- R(c);P_PINS(E),SBLOCK,XS(C)::B(F)
- R(c);SBLOCK::R(D)+S(E),XS(h)
- S(h);N_GUARD::S(C),XS(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).