MESON Chess Problem Database

Problem Display
PID: 231495 (8/5pQB/6n1/6k1/6P1/6K1/8/8 w - - 0 1)

Torngren, Pehr Hendrik

Aftonbladet, 1927

8/5pQB/6n1/6k1/6P1/6K1/8/8

#2

4 + 3

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Qxg6#
    • 1...f6
      • 2.Qxg6#
  • Tries
    • 1.Bxg6?
      • threat
        • 2.Bb1#
        • 2.Bc2#
        • 2.Bd3#
        • 2.Be4#
        • 2.Bf5#
        • 2.Bh5#
        • 2.Bxf7#
        • 2.Bh7#
      • 1...f5
        • 2.Bxf5#
        • 2.Bh5#
        • 2.Bf7#
        • 2.Bh7#
        • 2.Be8#
      • 1...f6
        • 2.Bb1#
        • 2.Bc2#
        • 2.Bd3#
        • 2.Be4#
        • 2.Bf5#
        • 2.Bh5#
        • 2.Bf7#
        • 2.Bh7#
        • 2.Be8#
      • 1...fxg6!
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Qxg6#
      • 1...Kh6
        • 2.Qxg6#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sh4
        • 2.Qf4#
      • 1...Se5
        • 2.Qf4#
      • 1...Se7
        • 2.Qf4#
      • 1...Sf8
        • 2.Qf4#
      • 1...Sh8
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • P(c);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • B(D);XS(b)
      • Threat
        • DUALS(8)
      • Refutation
        • P(c);P_SPINP(c),XB(D)
  • Actual
    • Q(C);N_PINS(b),XP(c)
    • Threat
      • QAR1(C),XS(b)
    • Vars
      • K(a);S_FLIGHT::QAR1(C),XS(b)
      • S(b);N_GUARD::QAB1(C),XS(b)
      • S(b);N_GUARD::QAB1(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).