MESON Chess Problem Database

Problem Display
PID: 235172 (1BN1R1q1/r1rP2pN/2Q1b1p1/4Pk2/4R2P/b4P2/4P3/7K w - - 0 1)

Erokhin, Vladimir Alekseevich

Schach, 1991

1BN1R1q1/r1rP2pN/2Q1b1p1/4Pk2/4R2P/b4P2/4P3/7K

#2

12 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh7
      • 2.Qxe6#
    • 1...Qf8
      • 2.Qxe6#
    • 1...Qh8
      • 2.Qxe6#
    • 1...Bc1
      • 2.Sd6#
      • 2.Se7#
    • 1...Bb2
      • 2.Sd6#
      • 2.Se7#
    • 1...Bd6
      • 2.Sxd6#
    • 1...Be7
      • 2.Sxe7#
  • Tries
    • 1.Rf4+?
      • 1...Kxe5
        • 2.Qe4#
      • 1...Kxf4!
    • 1.Rg4?
      • threat
        • 2.Qe4#
      • 1...Kxe5
        • 2.Qe4#
      • 1...Rxc6
        • 2.e4#
      • 1...Bd5
        • 2.Qxg6#
      • 1...Ra4!
    • 1.Qc1?
      • threat
        • 2.Qf4#
        • 2.Qg5#
      • 1...Bxc1
        • 2.Sd6#
        • 2.Se7#
      • 1...g5
        • 2.Qxg5#
      • 1...Be7
        • 2.Sxe7#
        • 2.Qf4#
      • 1...Rxc1+!
  • Keys
    • 1.Rb4!
      • threat
        • 2.Qe4#
      • 1...Kxe5
        • 2.Qe4#
        • 2.Qb5#
        • 2.Qc5#
      • 1...Rxc6
        • 2.Se7#
      • 1...Bd5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_GUARD,P_PINP(E),XS(I)::QAB1(G),XB(c)
    • Q(h);N_GUARD::QAB1(G),XB(c)
    • B(a);N_GUARD::S(K),XB(a)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINB(c),P_SPINR(f),XP(F)::QAR1(G)
      • Refutation
        • K(b);P-FLIGHT,XR(D)
    • Try
      • R(D);
      • Threat
        • QAB1(G)
      • Vars
        • K(b);P-FLIGHT,P_SPINB(c),P_SPINR(f),XP(F)::QAR1(G)
        • R(f);XQ(G)::P(B)
        • B(c);OGATE,P_PINP(C)::QAB1(G),XP(d)
      • Refutation
        • R(e);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);::QAR1(G),XP(d)
      • Refutation
        • R(f);CHECK,XQ(G)
  • Actual
    • R(D);
    • Threat
      • QAB1(G)
    • Vars
      • R(f);XQ(G)::S(K)
      • B(c);P_PINP(C)::S(K)
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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).