MESON Chess Problem Database

Problem Display
PID: 25716 (8/2p5/2Q5/8/6Pp/4p2p/4KbR1/4N2k w - - 0 1)

White, James R

Problem Observer, 2000

8/2p5/2Q5/8/6Pp/4p2p/4KbR1/4N2k

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Rf2#
    • 1...hxg2
      • 2.Qxg2#
    • 1...h2
      • 2.Rg3#
  • Tries
    • 1.Kf1?
      • threat
        • 2.Rxf2#
      • 1...hxg2+
        • 2.Qxg2#
      • 1...Bxe1
        • 2.Ra2#
        • 2.Rb2#
        • 2.Rc2#
        • 2.Rd2#
        • 2.Re2#
        • 2.Rf2#
      • 1...Bg1
        • 2.Ra2#
        • 2.Rb2#
        • 2.Rc2#
        • 2.Rd2#
        • 2.Re2#
        • 2.Rf2#
      • 1...Bg3
        • 2.Ra2#
        • 2.Rb2#
        • 2.Rc2#
        • 2.Rd2#
        • 2.Re2#
        • 2.Rf2#
      • 1...e2+!
    • 1.Rg1+?
      • 1...Kh2
        • 2.Sf3#
        • 2.Qh1#
      • 1...Kxg1!
    • 1.Rh2+?
      • 1...Kg1
        • 2.Sf3#
        • 2.Rh1#
        • 2.Qh1#
      • 1...Kxh2!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qxh3#
      • 1...hxg2
        • 2.Qxg2#
      • 1...Bg1
        • 2.Rf2#
      • 1...Bg3
        • 2.Qf1#
      • 1...h2
        • 2.Rg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(b);SBLOCK::QAB(E)+R(C)
    • P(d);OGATE,P_SPINP(d),XR(C)::QAB1(E),XP(d)
    • P(d);SBLOCK::QAB(E)+R(C)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAB(E)+R(C),XB(b)
      • Vars
        • P(d);CHECK,OGATE,P_SPINP(d),XR(C)::QAB1(E),XP(d)
      • Refutation
        • P(c);CHECK
    • Try
      • R(C);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(C)
    • Try
      • R(C);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(C)
  • Actual
    • Q(E);
    • Threat
      • QAR2(E),XP(d)
    • Vars
      • P(d);OGATE,P_SPINP(d),XR(C)::QAB1(E),XP(d)
      • B(b);SBLOCK::QAB(E)+R(C)
      • B(b);OGATE::QAR2(E)
      • P(d);SBLOCK::QAB(E)+R(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).