MESON Chess Problem Database

Problem Display
PID: 45378 (3R3K/3B1b2/qB6/2b1p3/pNkPn2R/Pp1p2pQ/3P4/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

3R3K/3B1b2/qB6/2b1p3/pNkPn2R/Pp1p2pQ/3P4/8

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Be6#
    • 1...g2
      • 2.Qxd3#
  • Tries
    • 1.Qe6+?
      • 1...Kxd4
        • 2.Sc6#
        • 2.Bxa4#
        • 2.Bb5#
        • 2.Bc6#
        • 2.Bc8#
        • 2.Be8#
      • 1...Bxe6!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qxd3#
      • 1...Kxd4
        • 2.Be6#
      • 1...Bxb4
        • 2.Qxf7#
      • 1...Sf2
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(e);P-FLIGHT,P_SPINB(g),P_SPINS(f),XP(E)::R(I)+B(H)
    • P(c);OGATE::QAB1(C),XP(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • B(j);XQ(C)
  • Actual
    • Q(C);P_PINP(b)
    • Threat
      • QAB1(C),XP(b)
    • Vars
      • K(e);N_SPINP(b),P-FLIGHT,P_SPINB(g),P_SPINS(f),XP(E)::R(I)+B(H)
      • B(g);XS(D)::QAB(C),XB(j)
      • S(f);N_GUARD::QAR(C)
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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).