MESON Chess Problem Database

Problem Display
PID: 43364 (4R1B1/Q5p1/N1ppn3/2P2n1R/3kPpp1/3p4/1K1N1P2/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

4R1B1/Q5p1/N1ppn3/2P2n1R/3kPpp1/3p4/1K1N1P2/8

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qxg7#
    • 1...Sxc5
      • 2.Sb3#
    • 1...Sg5
      • 2.Sb3#
    • 1...Sc7
      • 2.Sb3#
    • 1...Sd8
      • 2.Sb3#
    • 1...Sf8
      • 2.Sb3#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Sxc6#
      • 1...Ke5
        • 2.Qxg7#
      • 1...Sd8
        • 2.Sb3#
      • 1...Se7!
    • 1.Qxg7+?
      • 1...Sexg7
        • 2.Sb3#
      • 1...Sfxg7!
    • 1.cxd6+?
      • 1...Ke5
        • 2.Rxe6#
      • 1...Sc5
        • 2.Sb3#
        • 2.Qxc5#
      • 1...c5!
  • Keys
    • 1.Sb8!
      • threat
        • 2.Sxc6#
      • 1...Ke5
        • 2.Qxg7#
      • 1...Se7
        • 2.Qa4#
      • 1...Sd8
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • K(b);P_SPINS(e),S_FLIGHT::QAB(H),XP(i)
    • S(h);P_SPINS(h),XP(E)::S(B)
    • S(h);::S(B)
  • Tries
    • Try
      • S(G);
      • Threat
        • S(G),XP(f)
      • Vars
        • K(b);P_SPINS(e),S_FLIGHT::QAB(H),XP(i)
        • S(h);::S(B)
      • Refutation
        • S(e);
    • Try
      • Q(H);CHECK,XP(i)
      • Vars
        • S(h);XQ(H)::S(B)
      • Refutation
        • S(e);XQ(H)
    • Try
      • P(E);CHECK,XP(g)
      • Vars
        • K(b);P_SPINS(e),S_FLIGHT::R1(I),XS(h)
      • Refutation
        • P(f);P_SPINP(f)
  • Actual
    • S(G);
    • Threat
      • S(G),XP(f)
    • Vars
      • K(b);P_SPINS(e),S_FLIGHT::QAB(H),XP(i)
      • S(e);::QAR(H)
      • S(h);::S(B)
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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).