MESON Chess Problem Database

Problem Display
PID: 138721 (8/1R6/BP6/2Q5/2p5/1k6/8/2K5 w - - 0 1)

Lincoln, Robert A

StrateGems, 2010

8/1R6/BP6/2Q5/2p5/1k6/8/2K5

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qxc4#
  • Tries
    • 1.Bxc4+?
      • 1...Ka4
        • 2.Ra7#
      • 1...Kc3!
    • 1.Qb4+?
      • 1...Ka2
        • 2.Qb2#
        • 2.Qa4#
      • 1...Kxb4!
    • 1.Qb5+?
      • 1...Ka2
        • 2.Qa4#
        • 2.Qb2#
      • 1...Kc3
        • 2.Qxc4#
      • 1...Ka3!
  • Keys
    • 1.Ra7!
      • 1...Ka2
        • 2.Bxc4#
      • 1...Kc3
        • 2.Qxc4#
      • 1...Ka4
        • 2.Bxc4#
      • 1...c3
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINP(b)::QAR1(B),XP(b)
  • Tries
    • Try
      • B(C);CHECK,XP(b)
      • Vars
        • K(a);S_FLIGHT::R(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B),XP(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(E);
    • Vars
      • K(a);S_FLIGHT::R(E)+B(C),DCHECK,XP(b)
      • K(a);P-FLIGHT,P_SPINP(b)::QAR1(B),XP(b)
      • K(a);S_FLIGHT::R(E)+B(C),XP(b)
      • P(b);SBLOCK::B(C)
HTML5 logo

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).