MESON Chess Problem Database

Problem Display
PID: 262839 (8/1Q2R2B/2pPrpN1/2P1N3/2Rbk1p1/p5P1/4K3/2B5 w - - 0 1)

Blunar, Stefan

Szachy, 1976

8/1Q2R2B/2pPrpN1/2P1N3/2Rbk1p1/p5P1/4K3/2B5

#2

11 + 7

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qxc6#
    • 1...Kf5
      • 2.Qb1#
    • 1...f5
      • 2.Qxc6#
  • Tries
    • 1.Sf4+?
      • 1...Kxe5
        • 2.Rxe6#
      • 1...f5!
    • 1.Rxd4+?
      • 1...Kf5
        • 2.Qb1#
      • 1...Kxd4!
    • 1.Rxe6?
      • 1...Kd5
        • 2.Sf4#
      • 1...Kf5
        • 2.Sf8#
      • 1...fxe5
        • 2.Sf4#
        • 2.Se7#
        • 2.Rxe5#
      • 1...f5
        • 2.Qxc6#
      • 1...a2!
  • Keys
    • 1.Sxc6!
      • threat
        • 2.Sxd4#
      • 1...Kd5+
        • 2.Sce5#
      • 1...Kf5+
        • 2.Sge5#
      • 1...Rxe7
        • 2.Scxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(c);N_GUARD,N_SPINB(b),P_PINS(F),S_FLIGHT::QAB1(I),XP(e)
    • K(c);N_GUARD,N_SPINB(b),N_SPINP(e),P_PINS(F),S_FLIGHT::QAB(I)
    • P(g);SBLOCK::QAB(I),XP(e)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(c);N_SPINB(b),N_SPINP(e),P-FLIGHT,P_SPINR(f),S_CUTP(g),XS(F)::R1(J),XR(f)
      • Refutation
        • P(g);N_SPINP(e),P_SPINP(g)
    • Try
      • R(D);CHECK,XB(b)
      • Vars
        • K(c);N_GUARD,N_SPINP(e),P_PINS(F),S_FLIGHT::QAB(I)
      • Refutation
        • K(c);N_SPINP(e),P-FLIGHT,P_PINS(F),XR(D)
    • Try
      • R(J);XR(f)
      • Vars
        • K(c);N_SPINB(b),S_CUTP(g),S_FLIGHT::S(H)
        • K(c);N_GUARD,N_SPINB(b),N_SPINP(e),S_CUTP(g),S_FLIGHT::B(K)+S(H)
        • P(g);SBLOCK::QAB(I),XP(e)
      • Refutation
        • P(a);
  • Actual
    • S(F);P_PINR(f),XP(e)
    • Threat
      • QAB(I)+S(F),XB(b)
    • Vars
      • K(c);CHECK,N_GUARD,N_SPINB(b),N_SPINR(f),S_FLIGHT::QAB(I)+S(F)
      • K(c);CHECK,N_GUARD,N_SPINB(b),N_SPINR(f),S_CUTP(g),S_FLIGHT::B(K)+S(H)
      • R(f);N_SPINR(f),XR(J)::QAB(I)+S(F),XR(f)
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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).