MESON Chess Problem Database

Problem Display
PID: 183424 (1RKB1bb1/p2p4/k2p1r1R/8/N7/8/r7/Q3N3 w - - 0 1)

Webster, LJ

The Problemist, 1943

1RKB1bb1/p2p4/k2p1r1R/8/N7/8/r7/Q3N3

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rb2
      • 2.Sc5#
    • 1...Rc2+
      • 2.Sc5#
    • 1...Rd2
      • 2.Sc5#
    • 1...Re2
      • 2.Sc5#
    • 1...Raf2
      • 2.Sc5#
    • 1...Rg2
      • 2.Sc5#
    • 1...Rh2
      • 2.Sc5#
    • 1...Rxa4
      • 2.Qxa4#
    • 1...Rf1
      • 2.Sc5#
    • 1...Rff2
      • 2.Sc5#
    • 1...Rf3
      • 2.Sc5#
    • 1...Rf4
      • 2.Sc5#
    • 1...Rf7
      • 2.Sc5#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sb4#
      • 1...Rc2+
        • 2.Sac5#
      • 1...Rb2
        • 2.Sac5#
      • 1...Rf4
        • 2.Sdc5#
        • 2.Sac5#
      • 1...d5!
    • 1.Rxf6?
      • threat
        • 2.Sc5#
      • 1...Rxa4
        • 2.Qxa4#
      • 1...Be6!
  • Keys
    • 1.Sc2!
      • threat
        • 2.Sb4#
      • 1...Rxc2+
        • 2.Sc5#
      • 1...Rb2
        • 2.Sc5#
      • 1...Rf4
        • 2.Sc5#
      • 1...d5
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • R(a);::QAR(A)+S(C),DCHECK
    • R(a);CHECK::QAR(A)+S(C),DCHECK
    • R(a);OGATE,P_SPINR(a),XS(C)::QAR2(A),XR(a)
    • R(d);P_SPINP(c)::S(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • R(a);CHECK::QAR(A)+S(C),DCHECK
        • R(a);::QAR(A)+S(C),DCHECK
      • Refutation
        • P(c);P_SPINR(d)
    • Try
      • R(D);P_PINP(c),XR(d)
      • Threat
        • S(C)
      • Vars
        • R(a);OGATE,P_SPINR(a),XS(C)::QAR2(A),XR(a)
      • Refutation
        • B(h);N_SPINP(c)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • R(a);CHECK,XS(B)::QAR(A)+S(C),DCHECK
      • R(a);::QAR(A)+S(C),DCHECK
      • R(d);P_SPINP(c)::S(C)
      • P(c);P_SPINR(d),S_CUTB(h)::QAB(A)
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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).