MESON Chess Problem Database

Problem Display
PID: 42298 (8/1bB1p3/1p2N2Q/3kpp2/R4p2/1n6/N1R1PKn1/8 w - - 0 1)

Kopnin, Aleksey Grigorevich

Popkov, Nikolai Nikolaevich

1/2 Prize, Szachy, 1978

8/1bB1p3/1p2N2Q/3kpp2/R4p2/1n6/N1R1PKn1/8

#2

8 + 9

3750 FIDE Album (1977-1979) 1984

SOLUTION

  • SOUND
  • Sets
    • 1...Bc6
      • 2.Sc3#
    • 1...e4
      • 2.Sb4#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Qe6#
      • 1...Sxc5
        • 2.Sc3#
      • 1...bxc5
        • 2.Sc3#
      • 1...e6
        • 2.Qxe6#
      • 1...Sd4
        • 2.Sb4#
      • 1...Bc8!
    • 1.Sg7?
      • threat
        • 2.Qe6#
      • 1...Bc8
        • 2.Qc6#
      • 1...Sc5
        • 2.Sc3#
      • 1...e6
        • 2.Qxe6#
      • 1...Sd4!
    • 1.Sd8?
      • threat
        • 2.Qe6#
      • 1...Bc8
        • 2.Qc6#
      • 1...Sc5
        • 2.Sc3#
      • 1...e6
        • 2.Qxe6#
      • 1...Sd4!
    • 1.Sf8?
      • threat
        • 2.Qe6#
      • 1...Bc8
        • 2.Qc6#
      • 1...Sc5
        • 2.Sc3#
      • 1...e6
        • 2.Qxe6#
      • 1...Sd4!
    • 1.Bb8?
      • threat
        • 2.Sc7#
      • 1...e4
        • 2.Sb4#
      • 1...Sd4!
    • 1.Re4?
      • threat
        • 2.Rxe5#
      • 1...Kxe4
        • 2.Sc3#
      • 1...fxe4
        • 2.Sb4#
      • 1...Sc5!
    • 1.e4+?
      • 1...fxe4
        • 2.Sb4#
      • 1...fxe4 ep+!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qe6#
      • 1...Bc8
        • 2.Qc6#
      • 1...Sd4
        • 2.Sb4#
      • 1...Sc5
        • 2.Sc3#
      • 1...e6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(h);SBLOCK::S(A)
    • P(e);SBLOCK::S(A)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAB1(G)
      • Vars
        • S(b);SBLOCK,XS(F)::S(A)
        • P(g);SBLOCK,XS(F)::S(A)
        • P(i);::QAB1(G),XP(i)
        • S(b);SBLOCK::S(A)
      • Refutation
        • B(h);
    • Try
      • S(F);
      • Threat
        • QAB1(G)
      • Vars
        • B(h);N_GUARD::QAB1(G)
        • S(b);SBLOCK::S(A)
        • P(i);::QAB1(G),XP(i)
      • Refutation
        • S(b);
    • Try
      • S(F);
      • Threat
        • QAB1(G)
      • Vars
        • B(h);N_GUARD::QAB1(G)
        • S(b);SBLOCK::S(A)
        • P(i);::QAB1(G),XP(i)
      • Refutation
        • S(b);
    • Try
      • S(F);
      • Threat
        • QAB1(G)
      • Vars
        • B(h);N_GUARD::QAB1(G)
        • S(b);SBLOCK::S(A)
        • P(i);::QAB1(G),XP(i)
      • Refutation
        • S(b);
    • Try
      • B(H);
      • Threat
        • S(F)
      • Vars
        • P(e);SBLOCK::S(A)
      • Refutation
        • S(b);
    • Try
      • R(E);
      • Threat
        • R1(E),XP(e)
      • Vars
        • K(d);S_FLIGHT,XR(E)::S(A)
        • P(f);SBLOCK,XR(E)::S(A)
      • Refutation
        • S(b);
    • Try
      • P(C);CHECK
      • Vars
        • P(f);SBLOCK,XP(C)::S(A)
      • Refutation
        • P(c);CHECK,EP,XP(C)
  • Actual
    • S(F);
    • Threat
      • QAB1(G)
    • Vars
      • B(h);N_GUARD::QAB1(G)
      • S(b);SBLOCK::S(A)
      • P(i);::QAB1(G),XP(i)
HTML5 logo

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).