MESON Chess Problem Database

Problem Display
PID: 45558 (8/B2N2QK/1np2p1R/NpPr1R2/1p1kBP2/8/b2PP3/b7 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/B2N2QK/1np2p1R/NpPr1R2/1p1kBP2/8/b2PP3/b7

#2

12 + 9

SOLUTION

  • SOUND
  • Tries
    • 1.Qxf6+?
      • 1...Re5
        • 2.Qxe5#
      • 1...Kxe4!
    • 1.Qg2?
      • threat
        • 2.e3#
      • 1...Sc4
        • 2.Sxc6#
      • 1...Rxd7+!
    • 1.Qe7?
      • threat
        • 2.e3#
      • 1...Sc4
        • 2.Sxc6#
      • 1...Re5!
  • Keys
    • 1.Sxf6!
      • threat
        • 2.Qg1#
      • 1...Kxc5
        • 2.Sd7#
      • 1...Rd7
        • 2.e3#
      • 1...Sc4
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(K);CHECK,XP(i)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(K),XR(f)
      • Refutation
        • K(d);P-FLIGHT,XB(C)
    • Try
      • Q(K);N_PINP(i)
      • Threat
        • P(B)
      • Vars
        • S(g);SBLOCK::S(E),XP(h)
      • Refutation
        • R(f);CHECK,XS(J)
    • Try
      • Q(K);N_PINP(i)
      • Threat
        • P(B)
      • Vars
        • S(g);SBLOCK::S(E),XP(h)
      • Refutation
        • R(f);
  • Actual
    • S(J);XP(i)
    • Threat
      • QAB(K)
    • Vars
      • K(d);P_SPINR(f),P_SPINS(g),S_FLIGHT,XP(F)::S(J)
      • R(f);P_PINQ(K)::P(B)
      • S(g);SBLOCK::S(E),XP(h)
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).