MESON Chess Problem Database

Problem Display
PID: 45347 (8/Q6B/KN2R3/4nb2/1Ppk4/2b1n3/8/2N1R3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/Q6B/KN2R3/4nb2/1Ppk4/2b1n3/8/2N1R3

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Se2#
    • 1...Bc2
      • 2.Se2#
    • 1...Bh3
      • 2.Se2#
    • 1...Bxe6
      • 2.Se2#
    • 1...Sd1
      • 2.Rd6#
    • 1...Sf1
      • 2.Rd6#
    • 1...Sc2
      • 2.Rd6#
    • 1...Sg2
      • 2.Rd6#
    • 1...S3g4
      • 2.Rd6#
    • 1...Sd3
      • 2.Se2#
  • Tries
    • 1.Rd6+?
      • 1...Sd5
        • 2.Sa4#
        • 2.Sxd5#
        • 2.Sd7#
        • 2.Sa8#
        • 2.Sc8#
        • 2.Rxd5#
      • 1...Ke4!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxe5#
      • 1...Ke4
        • 2.Qg4#
      • 1...Bxe6
        • 2.Se2#
      • 1...Sg4
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • B(f);::S(A)
    • B(f);XR(F)::S(A)
    • S(b);N_GUARD::R(F)
    • S(e);SBLOCK::S(A)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • K(d);P-FLIGHT,P_SPINB(f),P_SPINS(b)
  • Actual
    • Q(G);P_PINS(e)
    • Threat
      • QAB1(G),XS(e)
    • Vars
      • K(d);N_SPINS(e),P-FLIGHT,P_SPINB(f),P_SPINS(b)::QAR2(G)
      • B(f);XR(F)::S(A)
      • S(b);N_GUARD::R(F)
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).