MESON Chess Problem Database

Problem Display
PID: 45565 (KN2R3/3p4/5p1b/3pnQ2/N1pkPr1R/8/2P2PP1/3r2B1 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

KN2R3/3p4/5p1b/3pnQ2/N1pkPr1R/8/2P2PP1/3r2B1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qxd5#
      • 2.c3#
    • 1...Sf3
      • 2.Qxd5#
    • 1...Sg4
      • 2.Qxd5#
    • 1...Sc6
      • 2.Qxd5#
    • 1...Sg6
      • 2.Qxd5#
    • 1...Sf7
      • 2.Qxd5#
  • Tries
    • 1.Sc6+?
      • 1...Sxc6
        • 2.Qxd5#
      • 1...dxc6!
    • 1.Qe6?
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.f3#
      • 1...Rxf2
        • 2.Qb6#
      • 1...Rxe4
        • 2.Qb6#
      • 1...dxe4
        • 2.Qd6#
      • 1...dxe6!
  • Keys
    • 1.Qxd7!
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.f3#
      • 1...Rxf2
        • 2.Qa7#
      • 1...Rxe4
        • 2.Qa7#
      • 1...Sxd7
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(f);OGATE::QAR1(H),XP(e)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • S(f);OGATE,XS(J)::QAR1(H),XP(e)
      • Refutation
        • P(i);XS(J)
    • Try
      • Q(H);
      • Threat
        • QAR1(H),XP(e)
      • Vars
        • K(c);P-FLIGHT,P_SPINR(d),P_SPINS(f),XP(F)::P(C)
        • R(d);P_SPINR(d),XP(C)::QAB(H)
        • R(d);P_SPINR(d),XP(F)::QAB(H)
        • P(e);OGATEB,SBLOCK,XP(F)::QAR2(H)
      • Refutation
        • P(i);XQ(H)
  • Actual
    • Q(H);P_PINP(e),XP(i)
    • Threat
      • QAR1(H),XP(e)
    • Vars
      • K(c);N_SPINP(e),P-FLIGHT,P_SPINR(d),P_SPINS(f),XP(F)::P(C)
      • R(d);P_SPINR(d),XP(C)::QAB(H)
      • R(d);P_SPINR(d),XP(F)::QAB(H)
      • S(f);N_GUARD,N_SPINP(e),XQ(H)::S(J)
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).