MESON Chess Problem Database

Problem Display
PID: 175094 (8/Q7/8/8/bp6/k7/8/K7 w - - 0 1)

Decker, Adolfph L

Checkmate, 1902

8/Q7/8/8/bp6/k7/8/K7

#2

2 + 3

6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.Qc5#
      • 2.Qe7#
  • Tries
    • 1.Kb1?
      • 1...b3
        • 2.Qc5#
        • 2.Qe7#
      • 1...Kb3!
    • 1.Qe3+?
      • 1...b3
        • 2.Qc5#
        • 2.Qe7#
      • 1...Bb3!
    • 1.Qa5?
      • 1...b3
        • 2.Qc5#
      • 1...Kb3!
    • 1.Qf7?
      • threat
        • 2.Qa2#
      • 1...b3
        • 2.Qe7#
        • 2.Qf8#
      • 1...Bb3!
    • 1.Qa8?
      • 1...b3
        • 2.Qf8#
      • 1...Kb3!
  • Keys
    • 1.Qa6!
      • 1...Kb3
        • 2.Qd3#
      • 1...b3
        • 2.Qd6#

This anticipates 145177(1986)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Refutation
        • K(a);N_SPINB(b),P-FLIGHT
    • Try
      • Q(B);CHECK,N_PINB(b)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(B)
      • Refutation
        • K(a);N_SPINB(b),P-FLIGHT
    • Try
      • Q(B);N_PINB(b)
      • Threat
        • QAR1(B)
      • Refutation
        • B(b);
    • Try
      • Q(B);
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(B)
      • Refutation
        • K(a);N_SPINB(b),P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);N_SPINB(b),P-FLIGHT::QAR2(B)
      • P(c);OGATEB,SBLOCK::QAB(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).