MESON Chess Problem Database

Problem Display
PID: 230770 (2n1Q1q1/4p1p1/Kp2Rp2/1p2N3/2n1kNp1/2B2pP1/4bP2/4R3 w - - 0 1)

Russell, Tom

The Problemist, 1988

2n1Q1q1/4p1p1/Kp2Rp2/1p2N3/2n1kNp1/2B2pP1/4bP2/4R3

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qg6#
    • 1...fxe5
      • 2.Qg6#
    • 1...f5
      • 2.Qc6#
  • Tries
    • 1.Sxc4+?
      • 1...Kf5
        • 2.Qxb5#
        • 2.Qg6#
      • 1...Qxe6!
  • Keys
    • 1.Qxb5!
      • threat
        • 2.Qb1#
      • 1...Kf5
        • 2.Sxc4#
      • 1...Sxe5
        • 2.Qd3#
      • 1...Qd8
        • 2.Sxc4#
      • 1...Sb2
        • 2.Sf7#
      • 1...Sd2
        • 2.Sf7#
        • 2.Qd3#
      • 1...Sa3
        • 2.Sf7#
        • 2.Qd3#
      • 1...Se3
        • 2.Sf7#
      • 1...Sa5
        • 2.Sf7#
        • 2.Qd3#
      • 1...S4d6
        • 2.Sf7#
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • K(d);N_SPINB(a),S_FLIGHT::QAB1(I)
    • P(h);N_GUARD,P_SPINP(h),XS(F)::QAB(I)
    • P(h);SBLOCK::QAB(I)
  • Tries
    • Try
      • S(F);CHECK,XS(c)
      • Refutation
        • Q(l);XR(H)
  • Actual
    • Q(I);XP(f)
    • Threat
      • QAB(I)
    • Vars
      • K(d);N_SPINB(a),S_FLIGHT::QAR(I)+S(F),XS(c)
      • S(c);OGATE,P_PINQ(I),P_SPINS(c),XS(F)::QAB1(I)
      • Q(l);N_GUARD::R(H)+S(F),XS(c)
      • S(c);N_GUARD,P_PINQ(I)::R(H)+S(F)
      • S(c);N_GUARD,N_SPINB(a),P_PINQ(I)::R(H)+S(F)
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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).