MESON Chess Problem Database

Problem Display
PID: 132484 (8/8/8/4Q2N/8/8/3N2k1/3K4 w - - 0 1)

Koltanowski, George

San Francisco Chronicle, 1964

8/8/8/4Q2N/8/8/3N2k1/3K4

#2

4 + 1

5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf2
      • 2.Qg3#
    • 1...Kh3
      • 2.Qg3#
  • Tries
    • 1.Qe1?
      • 1...Kh3
        • 2.Qg3#
      • 1...Kh2!
  • Keys
    • 1.Sf3!
      • 1...Kf1
        • 2.Qe2#
      • 1...Kh1
        • 2.Qh2#
      • 1...Kf2
        • 2.Qe2#
      • 1...Kxf3
        • 2.Qe2#
      • 1...Kh3
        • 2.Qg3#

Anticipated by 208731(1875), 223474(1926)

This anticipates 77651(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAB1(C)
    • K(a);S_FLIGHT::QAR1(C)
  • Tries
    • Try
      • Q(C);
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(B);
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • K(a);S_FLIGHT::QAR1(C)
      • K(a);P-FLIGHT::QAR1(C)
      • K(a);S_FLIGHT,XS(B)::QAB1(C)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).