MESON Chess Problem Database

Problem Display
PID: 207483 (3B2B1/5Pk1/8/8/8/7Q/2b5/4K3 w - - 0 1)

Courtenay, Edward H

Chess Journal, 1871

3B2B1/5Pk1/8/8/8/7Q/2b5/4K3

#2

5 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kg6
      • 2.Qh7#
    • 1...Kf8
      • 2.Qh6#
  • Tries
    • 1.Qh7+?
      • 1...Kf8
        • 2.Qh6#
      • 1...Bxh7!
    • 1.f8Q+?
      • 1...Kg6
        • 2.Bf7#
        • 2.Bh7#
        • 2.Qg4#
        • 2.Qfh6#
        • 2.Qhh6#
        • 2.Qh7#
        • 2.Qf6#
        • 2.Qf7#
      • 1...Kxf8!
  • Keys
    • 1.Qh8+!
      • 1...Kg6
        • 2.Qh7#
      • 1...Kf8
        • 2.Qh6#
      • 1...Kxh8
        • 2.Bf6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAB1(B)
    • K(b);S_FLIGHT::QAB(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB(B)
      • Refutation
        • B(a);XQ(B)
    • Try
      • P(C);CHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
  • Actual
    • Q(B);CHECK
    • Vars
      • K(b);P-FLIGHT::QAB1(B)
      • K(b);S_FLIGHT::QAB(B)
      • K(b);S_FLIGHT,XQ(B)::B(D)
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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).