MESON Chess Problem Database

Problem Display
PID: 121727 (4N2n/7p/6k1/8/7Q/4K3/B7/8 w - - 0 1)

Hellstrom, Ake

Source?, 1935

4N2n/7p/6k1/8/7Q/4K3/B7/8

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2018
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qh5#
    • 1...Sf7
      • 2.Bb1#
  • Tries
    • 1.Qh6+?
      • 1...Kf5
        • 2.Qh5#
      • 1...Kxh6!
  • Keys
    • 1.Bg8!
      • 1...Kf5
        • 2.Qh5#
      • 1...h5
        • 2.Qf6#
      • 1...Sf7
        • 2.Bxh7#
      • 1...h6
        • 2.Qg4#

This anticipates 81456(1983), 234871(2004), 260080(2005)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR2(C)
    • S(c);SBLOCK::B(A)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
  • Actual
    • B(A);
    • Vars
      • K(a);S_FLIGHT::QAR2(C)
      • P(b);SBLOCK::QAR1(C)
      • S(c);SBLOCK::B(A),XP(b)
      • P(b);SBLOCK::QAR2(C)
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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).