MESON Chess Problem Database

Problem Display
PID: 27214 (R1q5/n1bR4/1k6/2NP4/P7/2B5/8/1K3Q2 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

R1q5/n1bR4/1k6/2NP4/P7/2B5/8/1K3Q2

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Qxb5#
    • 1...Sc6
      • 2.Qb5#
  • Tries
    • 1.Ba5+?
      • 1...Kxa5
        • 2.Qb5#
      • 1...Kxc5!
    • 1.Qc4?
      • threat
        • 2.a5#
      • 1...Sc6
        • 2.Qb5#
      • 1...Qa6!
    • 1.Qf6+?
      • 1...Kxc5
        • 2.Qd4#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Bd6!
  • Keys
    • 1.Bb4!
      • threat
        • 2.a5#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Sc6
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::QAR1(B),XS(b)
    • S(b);N_GUARD::QAR1(B)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT,XB(C)::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT,XS(E)
    • Try
      • Q(B);
      • Threat
        • P(D)
      • Vars
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • Q(d);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(E)::QAB1(B)
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • B(C);
    • Threat
      • P(D)
    • Vars
      • Q(d);N_GUARD::QAR1(B),XQ(d)
      • S(b);N_GUARD::QAR1(B)
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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).