MESON Chess Problem Database

Problem Display
PID: 27506 (1K4Q1/8/8/8/1R6/8/2pB4/kn1N4 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

1K4Q1/8/8/8/1R6/8/2pB4/kn1N4

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Bc3#
    • 1...Sc3
      • 2.Bxc3#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qb2#
      • 1...cxd1S
        • 2.Qxb1#
      • 1...c1B
        • 2.Qxb1#
      • 1...c1Q!
    • 1.Qg7+?
      • 1...Ka2
        • 2.Qb2#
      • 1...Sc3!
    • 1.Qh8+?
      • 1...Ka2
        • 2.Qb2#
      • 1...Sc3!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Qa2#
      • 1...Sxc3
        • 2.Bxc3#
      • 1...c1S
        • 2.Rxb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::B(B)
    • S(b);N_GUARD::B(B),XS(b)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • P(c);N_GUARD,XS(A)::QAR1(E),XS(b)
        • P(c);N_GUARD::QAR1(E),XS(b)
      • Refutation
        • P(c);
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • S(A);
    • Threat
      • QAR1(E)
    • Vars
      • S(b);OGATE,XS(A)::B(B),XS(b)
      • P(c);N_GUARD::R1(C),XS(b)
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).