MESON Chess Problem Database
Problem Display
PID: 179683 (5R1N/4p1r1/2p1P2R/1nN1kp2/p7/Pp2P3/1K1Q4/2B5 w - - 0 1)
Kopnin, Aleksey Grigorevich
Source?, 1948
#2
10 + 8
| 6490 | yacpdb | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Rg1
- 2.Sf7#
- 1...Rg2
- 2.Sf7#
- 1...Rg3
- 2.Sf7#
- 1...Rg4
- 2.Sf7#
- 1...Rg5
- 2.Sf7#
- 1...Rg6
- 2.Sxg6#
- 1...Rf7
- 2.Sxf7#
- 1...Rh7
- 2.Sg6#
- 1...Rg8
- 2.Sf7#
- 1...Sxa3
- 2.Qd4#
- 1...Sc3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sd6
- 2.Qd4#
- 1...Sa7
- 2.Qd4#
- 1...Sc7
- 2.Qd4#
- 1...f4
- 2.exf4#
- 1...Rg1
- Tries
- 1.Ka1?
- 1...Sxa3
- 2.Bb2#
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Rg1
- 2.Sf7#
- 1...Rg2
- 2.Sf7#
- 1...Rg3
- 2.Sf7#
- 1...Rg4
- 2.Sf7#
- 1...Rg5
- 2.Sf7#
- 1...Rg6
- 2.Sxg6#
- 1...Rf7
- 2.Sxf7#
- 1...Rh7
- 2.Sg6#
- 1...Rg8
- 2.Sf7#
- 1...Sc3
- 2.Qd4#
- 1...Sd6
- 2.Bb2#
- 2.Qd4#
- 1...Sa7
- 2.Bb2#
- 2.Qd4#
- 1...Sc7
- 2.Bb2#
- 2.Qd4#
- 1...f4
- 2.exf4#
- 1...b2+!
- 1...Sxa3
- 1.Rg6?
- 1...Rxg6
- 2.Sxg6#
- 1...Sxa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Rf7
- 2.Sxf7#
- 1...Rg8
- 2.Sf7#
- 1...Sc3
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sa7
- 2.Qd4#
- 1...Sc7
- 2.Qd4#
- 1...f4
- 2.exf4#
- 1...Rh7!
- 1...Rxg6
- 1.Qd1?
- 1...Sxa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Rg1
- 2.Sf7#
- 1...Rg3
- 2.Sf7#
- 1...Rg4
- 2.Sf7#
- 1...Rg5
- 2.Sf7#
- 1...Rg6
- 2.Sxg6#
- 1...Rf7
- 2.Sxf7#
- 1...Rh7
- 2.Sg6#
- 1...Rg8
- 2.Sf7#
- 1...Sc3
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sa7
- 2.Qd4#
- 1...Sc7
- 2.Qd4#
- 1...f4
- 2.exf4#
- 1...Rg2+!
- 1...Sxa3
- 1.Qd3?
- threat
- 2.Sd7#
- 2.Rxf5#
- 1...Sd4
- 2.Qxd4#
- 1...Rg5
- 2.Sd7#
- 2.Sf7#
- 1...Rg6
- 2.Sxg6#
- 2.Rxf5#
- 1...Rf7
- 2.Sd7#
- 2.Sxf7#
- 1...Sd6
- 2.Sd7#
- 2.Qd4#
- 1...f4
- 2.Sd7#
- 2.Rf5#
- 2.exf4#
- 1...Rg2+!
- threat
- 1.Ka1?
- Keys
- 1.e4!
- threat
- 2.Rxf5#
- 1...fxe4
- 2.Sd7#
- 1...Sd4
- 2.Qf4#
- 1...Rg5
- 2.Sf7#
- 1...Rf7
- 2.Sxf7#
- 1...Sd6
- 2.Qc3#
- 1...f4
- 2.Rf5#
- threat
- 1.e4!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 3
- ADDED MATES = 1
- REMOVED MATES = 11
- Sets
- R(h);N_GUARD::S(J)
- R(h);N_GUARD,P_PINQ(C)::S(J)
- R(h);N_GUARD::S(J),XR(h)
- S(c);N_GUARD,XP(D)::QAB1(C)
- S(c);N_GUARD::QAB1(C)
- S(c);N_GUARD::QAB1(C),XS(c)
- P(e);OGATE::P(E),XP(e)
- Tries
- Try
- K(B);S_FLIGHT
- Vars
- S(c);N_GUARD::QAB1(C),XS(c)
- R(h);N_GUARD,P_PINB(A)::S(J)
- R(h);N_GUARD::S(J)
- R(h);N_GUARD::S(J),XR(h)
- S(c);N_GUARD::QAB1(C)
- P(e);OGATE::P(E),XP(e)
- Refutation
- P(a);CHECK
- Try
- R(H);
- Vars
- R(h);XR(H)::S(J),XR(h)
- S(c);N_GUARD,XP(D)::QAB1(C)
- S(c);N_GUARD::QAB1(C),XS(c)
- R(h);N_GUARD::S(J),XR(h)
- R(h);N_GUARD::S(J)
- S(c);N_GUARD::QAB1(C)
- P(e);OGATE::P(E),XP(e)
- Refutation
- R(h);
- Try
- Q(C);
- Vars
- S(c);N_GUARD,XP(D)::QAB1(C)
- S(c);N_GUARD::QAB1(C),XS(c)
- R(h);N_GUARD::S(J)
- R(h);N_GUARD::S(J),XR(h)
- S(c);N_GUARD::QAB1(C)
- P(e);OGATE::P(E),XP(e)
- Refutation
- R(h);CHECK
- Try
- Q(C);
- Threat
- DUALS(2)
- Vars
- S(c);N_GUARD::QAB1(C),XS(c)
- Refutation
- R(h);CHECK
- Try
- Actual
- P(E);
- Threat
- R1(I),XP(e)
- Vars
- P(e);SBLOCK,XP(E)::S(F)
- S(c);SBLOCK::QAB1(C)
- R(h);N_GUARD::S(J)
- R(h);N_GUARD::S(J),XR(h)
- S(c);N_GUARD,SBLOCK::QAB(C)
- P(e);::R1(I)
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).