MESON Chess Problem Database

Problem Display
PID: 180442 (1K1B2B1/8/k2np2R/3P4/2P5/n7/p3Q1p1/R1N5 w - - 0 1)

Lider, Valentin Viktorovich

Mat, 1988

1K1B2B1/8/k2np2R/3P4/2P5/n7/p3Q1p1/R1N5

#2

9 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...exd5
      • 2.Rxd6#
    • 1...e5
      • 2.Rxd6#
  • Tries
    • 1.Sxa2?
      • threat
        • 2.Sb4#
      • 1...Saxc4
        • 2.Sc3#
      • 1...Sdxc4!
    • 1.Bxe6?
      • threat
        • 2.Bc8#
      • 1...Sdxc4
        • 2.Bd7#
      • 1...Sc8
        • 2.Bxc8#
      • 1...Saxc4!
    • 1.Qxe6?
      • threat
        • 2.Qc8#
        • 2.Qxd6#
      • 1...g1Q
        • 2.Qc8#
      • 1...g1B
        • 2.Qc8#
      • 1...Sb5
        • 2.Qc8#
      • 1...Sxc4!
  • Keys
    • 1.Rxa2!
      • threat
        • 2.Rxa3#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...Sb5
        • 2.cxb5#
      • 1...Sb7
        • 2.c5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(f);OGATE,P_SPINS(e),XP(E)::R(F),XS(e)
    • P(f);OGATE,P_SPINS(e)::R(F),XS(e)
  • Tries
    • Try
      • S(B);XP(a)
      • Threat
        • S(B)
      • Vars
        • S(c);P_SPINS(c),XP(D)::R(A)+S(B)
      • Refutation
        • S(e);P_SPINP(f),P_SPINS(e),XP(D)
    • Try
      • B(I);XP(f)
      • Threat
        • B(I)
      • Vars
        • S(e);OGATEB,P_SPINS(e),XP(D)::R(F)+B(I)
        • S(e);::R(F)+B(I),DCHECK,XS(e)
      • Refutation
        • S(c);P_SPINP(a),P_SPINS(c),XP(D)
    • Try
      • Q(C);P_PINS(e),XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAB(C)
        • S(c);P_SPINP(a)::QAB(C)
      • Refutation
        • S(c);P_SPINP(a),XP(D)
  • Actual
    • R(A);P_PINS(c),XP(a)
    • Threat
      • R(A),XS(c)
    • Vars
      • S(e);OGATE,P_SPINP(f),XP(D)::QAB(C),XS(e)
      • S(e);OGATE,P_SPINP(f)::P(D),XS(e)
      • S(e);N_GUARD,P_SPINP(f)::QAB(C)+P(D)
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).