MESON Chess Problem Database

Problem Display
PID: 45563 (K2R4/p2N4/4pQ2/r3r3/1PB1kN2/1Pb1npP1/n3P1p1/1b4B1 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

K2R4/p2N4/4pQ2/r3r3/1PB1kN2/1Pb1npP1/n3P1p1/1b4B1

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Sc5#
    • 1...Sc2
      • 2.Bd3#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Qf4#
      • 1...Kd4
        • 2.S7c5#
      • 1...Sxc4
        • 2.Qxf3#
      • 1...Rf5
        • 2.Sf2#
      • 1...Sd5
        • 2.Qxf3#
        • 2.exf3#
      • 1...Sf5!
    • 1.Sxe6?
      • threat
        • 2.Qxf3#
        • 2.Qf4#
        • 2.exf3#
      • 1...Rxe6
        • 2.Qf4#
        • 2.exf3#
      • 1...Sxc4
        • 2.Qxf3#
      • 1...fxe2
        • 2.Qf4#
      • 1...Sf5
        • 2.Sg5#
      • 1...Sd5
        • 2.Qxf3#
        • 2.exf3#
      • 1...f2
        • 2.Qf3#
        • 2.Qf4#
      • 1...Rf5!
    • 1.Bd3+?
      • 1...Kd4
        • 2.Sc5#
      • 1...Bxd3!
    • 1.exf3+?
      • 1...Kd4
        • 2.Se2#
        • 2.Sxe6#
        • 2.Sc5#
      • 1...Kxf3!
  • Keys
    • 1.Sh3!
      • threat
        • 2.Qf4#
      • 1...Kd4
        • 2.Sc5#
      • 1...Sxc4
        • 2.Qxf3#
      • 1...Sf5
        • 2.Sg5#
      • 1...Rf5
        • 2.Sf2#
      • 1...Sd5
        • 2.Qxf3#
        • 2.exf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(g);P-FLIGHT,P_SPINR(i),P_SPINS(e)::R(K)+S(I)
    • S(e);S_CUTB(a)::B(F)
  • Tries
    • Try
      • S(G);
      • Threat
        • QAR1(H)
      • Vars
        • K(g);P-FLIGHT,P_SPINR(i),P_SPINS(e)::R(K)+S(I)
        • S(e);XB(F)::QAB1(H),XP(f)
        • R(i);::S(G)
      • Refutation
        • S(e);
    • Try
      • S(G);XP(j)
      • Threat
        • DUALS(3)
      • Vars
        • S(e);XB(F)::QAB1(H),XP(f)
        • P(f);XP(B)::QAR1(H)
        • S(e);S_CUTR(i)::S(G)
      • Refutation
        • R(i);
    • Try
      • B(F);CHECK
      • Vars
        • K(g);P-FLIGHT,P_SPINR(i),P_SPINS(e)::R(K)+S(I)
      • Refutation
        • B(a);XB(F)
    • Try
      • P(B);CHECK,XP(f)
      • Refutation
        • K(g);S_FLIGHT,XP(B)
  • Actual
    • S(G);
    • Threat
      • QAR1(H)
    • Vars
      • K(g);P-FLIGHT,P_SPINR(i),P_SPINS(e)::R(K)+S(I)
      • S(e);XB(F)::QAB1(H),XP(f)
      • S(e);S_CUTR(i)::S(G)
      • R(i);::S(G)
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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).