MESON Chess Problem Database

Problem Display
PID: 268327 (5rq1/1p1P2p1/pNk1b1R1/1p3pP1/1Pr1N3/1K3B2/2RP3B/6Q1 w - - 0 1)

Vaughan, Colin V

1st Prize, KeyStip 27A. Ty., 1981

5rq1/1p1P2p1/pNk1b1R1/1p3pP1/1Pr1N3/1K3B2/2RP3B/6Q1

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qh7
      • 2.Rxe6#
    • 1...Qh8
      • 2.Rxe6#
    • 1...Rf7
      • 2.Rxe6#
    • 1...fxe4
      • 2.Bxe4#
  • Tries
    • 1.Sg3+?
      • 1...Kd6
        • 2.Sxf5#
      • 1...Kc7!
    • 1.Sd6+?
      • 1...Bd5
        • 2.Sf7#
      • 1...Kc7!
  • Keys
    • 1.Sc5+!
      • 1...Kxb6
        • 2.Sa4#
      • 1...Re4+
        • 2.Sxe6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(j);N_GUARD::R(K),XB(f)
    • R(i);S_CUTQ(j)::R(K),XB(f)
    • P(c);OGATE,P_SPINP(c),XS(H)::B(F),XP(c)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(e);N_SPINR(a),P-FLIGHT::B(D)+S(H),DCHECK,XP(c)
      • Refutation
        • K(e);N_SPINB(f),P-FLIGHT
    • Try
      • S(H);CHECK,N_PINB(f)
      • Vars
        • B(f);P_SPINB(f)::R(K)+S(H)
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • S(H);CHECK,N_PINR(a)
    • Vars
      • K(e);P-FLIGHT,XS(J)::QAB(A)+S(H),DCHECK
      • R(a);CHECK,P_SPINR(a)::R(B)+S(H),XB(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).