MESON Chess Problem Database

Problem Display
PID: 45456 (1B6/b6p/p1Kn1p2/3P4/3kprP1/N3R3/8/4R2Q w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B6/b6p/p1Kn1p2/3P4/3kprP1/N3R3/8/4R2Q

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Sc2#
  • Tries
    • 1.Sc2+?
      • 1...Ke5
        • 2.Bxd6#
      • 1...Kc4!
    • 1.Rd1+?
      • 1...Ke5
        • 2.Sc4#
        • 2.Bxd6#
      • 1...Kxe3!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Qb2#
      • 1...Ke5
        • 2.Rxe4#
      • 1...Rf2
        • 2.Bxa7#
      • 1...Sc4
        • 2.Sc2#
      • 1...Sb5
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(e);SBLOCK::S(C)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P_SPINP(b),P_SPINS(e),S_FLIGHT::B(H),XS(e)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XR(D)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • K(a);P_SPINP(b),P_SPINR(c),P_SPINS(e),S_FLIGHT::R1(D),XP(b)
      • R(c);::B(H),XB(g)
      • S(e);SBLOCK::S(C)
      • S(e);::QAR2(B)
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).