MESON Chess Problem Database

Problem Display
PID: 198987 (8/8/4ppp1/5kp1/8/4K3/4Q3/8 w - - 0 1)

Stewart, John

The Observer, 1945

(First published on Sun Jan 7 1945)

8/8/4ppp1/5kp1/8/4K3/4Q3/8

#2

2 + 5

5454 Near Snap 2019
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qb5+?
      • 1...e5
        • 2.Qd7#
      • 1...Kg4!
    • 1.Qc2+?
      • 1...Ke5
        • 2.Qc5#
      • 1...Kg4!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qe4#
      • 1...Ke5
        • 2.Qc5#
      • 1...g4
        • 2.Qf4#
      • 1...e5
        • 2.Qc8#

This anticipates 159941(1996)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);OGATEB,P_SPINP(c),SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(a);P-FLIGHT::QAR2(A)
      • P(b);N_GUARD::QAR1(A)
      • P(c);OGATEB,SBLOCK::QAB(A)
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).