MESON Chess Problem Database

Problem Display
PID: 45372 (r7/Q7/2Rp1B2/1PrkbK2/6pR/2pB4/5N2/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

r7/Q7/2Rp1B2/1PrkbK2/6pR/2pB4/5N2/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Bxc4#
    • 1...Rxb5
      • 2.Be4#
    • 1...Bh2
      • 2.Qf7#
    • 1...Bg3
      • 2.Qf7#
    • 1...Bd4
      • 2.Qf7#
    • 1...Bf4
      • 2.Qf7#
    • 1...g3
      • 2.Qf7#
  • Tries
    • 1.Bxe5?
      • threat
        • 2.Rxd6#
        • 2.Qf7#
      • 1...Rxb5
        • 2.Be4#
        • 2.Rxd6#
      • 1...Rxc6
        • 2.Qd4#
      • 1...Rxa7
        • 2.Rxd6#
      • 1...dxe5
        • 2.Qxc5#
        • 2.Qd7#
      • 1...Rd8
        • 2.Qf7#
      • 1...Re8
        • 2.Rxd6#
      • 1...Rf8+!
    • 1.Rxd6+?
      • 1...Bxd6
        • 2.Qf7#
      • 1...Kxd6!
  • Keys
    • 1.Sxg4!
      • threat
        • 2.Se3#
      • 1...Kd4
        • 2.Rxd6#
      • 1...Rxb5
        • 2.Be4#
      • 1...Bd4
        • 2.Qf7#
      • 1...Bf4
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(c);N_GUARD::B(B),XR(c)
    • R(c);XP(D)::B(B)
    • B(e);::QAB(H)
    • P(b);::QAB(H)
  • Tries
    • Try
      • B(G);XB(e)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);OGATE,XR(F)::QAR1(H)
        • R(g);XQ(H)::R1(F),XP(f)
        • R(g);::QAB(H)
        • R(g);::R1(F),XP(f)
      • Refutation
        • R(g);CHECK
    • Try
      • R(F);CHECK,XP(f)
      • Vars
        • B(e);SBLOCK,XR(F)::QAB(H)
      • Refutation
        • K(d);P-FLIGHT,XR(F)
  • Actual
    • S(A);XP(b)
    • Threat
      • S(A)
    • Vars
      • K(d);P-FLIGHT,P_SPINB(e),P_SPINR(c)::R(F),XP(f)
      • R(c);XP(D)::B(B)
      • B(e);::QAB(H)
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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).