MESON Chess Problem Database

Problem Display
PID: 11769 (8/pQ1b3B/1qPKp3/5rp1/p4p2/2B5/P3P2R/NkN4R w - - 0 1)

Flood, Colin Richard

The Problemist, 1971

8/pQ1b3B/1qPKp3/5rp1/p4p2/2B5/P3P2R/NkN4R

#2

11 + 9

721 Variantim 1990

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qxb2#
    • 1...Qb4+
      • 2.Qxb4#
    • 1...Qb5
      • 2.Qxb5#
    • 1...a5
      • 2.Qxb6#
    • 1...a6
      • 2.Qxb6#
  • Tries
    • 1.e3?
      • threat
        • 2.Scb3#
        • 2.Sd3#
      • 1...Qb4+
        • 2.Qxb4#
      • 1...fxe3
        • 2.Scb3#
      • 1...Qb2
        • 2.Qxb2#
      • 1...Qb3
        • 2.Scxb3#
        • 2.Sd3#
      • 1...Qb5
        • 2.Sd3#
        • 2.Qxb5#
      • 1...Bxc6!
  • Keys
    • 1.e4!
      • threat
        • 2.Sd3#
      • 1...Qb4+
        • 2.Qxb4#
      • 1...Rd5+
        • 2.exd5#
      • 1...fxe4 ep
        • 2.Scb3#
      • 1...Qb2
        • 2.Qxb2#
      • 1...Rb5
        • 2.e5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(f);N_PINP(H),OGATE::QAR1(J),XQ(f)
    • Q(f);CHECK,N_PINP(H),OGATE::QAR(J),XQ(f)
    • Q(f);N_PINP(H),OGATE::QAR(J),XQ(f)
    • P(h);N_GUARD::QAR(J),XQ(f)
  • Tries
    • Try
      • P(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);CHECK,N_PINP(H),OGATE::QAR(J),XQ(f)
        • P(c);XP(E)::R(C)+S(B)
        • Q(f);N_PINP(H),OGATE::QAR1(J),XQ(f)
      • Refutation
        • B(i);XP(H)
  • Actual
    • P(E);N_PINR(d)
    • Threat
      • R(C)+S(B)
    • Vars
      • Q(f);CHECK,N_PINP(H),OGATE::QAR(J),XQ(f)
      • R(d);CHECK,OGATE::B(K)+P(E),XR(d)
      • P(c);EP,P_SPINR(d),XP(E)::R(C)+S(B)
      • Q(f);N_PINP(H),OGATE::QAR1(J),XQ(f)
      • R(d);N_SPINQ(f)::B(K)+P(E)
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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).