MESON Chess Problem Database

Problem Display
PID: 203204 (5b1k/6pp/6R1/3B4/1p5Q/8/8/4K3 w - - 0 1)

Drnek, Josef

Prachensky kraj, 1924

5b1k/6pp/6R1/3B4/1p5Q/8/8/4K3

#2

4 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...h5
      • 2.Qxh5#
  • Tries
    • 1.Qd4?
      • 1...hxg6
        • 2.Qh4#
      • 1...h5
        • 2.Rh6#
      • 1...h6
        • 2.Rxh6#
      • 1...Bc5
        • 2.Qxg7#
      • 1...Bd6
        • 2.Qxg7#
      • 1...Be7
        • 2.Qxg7#
      • 1...b3!
    • 1.Qh6?
      • 1...gxh6
        • 2.Rg8#
      • 1...Bc5
        • 2.Qxg7#
      • 1...Bd6
        • 2.Qxg7#
      • 1...Be7
        • 2.Qxg7#
      • 1...b3!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxf8#
      • 1...gxf6
        • 2.Rg8#
      • 1...hxg6
        • 2.Qh4#
      • 1...h5
        • 2.Rh6#
      • 1...h6
        • 2.Rxh6#
      • 1...Bc5
        • 2.Qxg7#
      • 1...Bd6
        • 2.Qxg7#
      • 1...Be7
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB::QAR(B),XP(c)
  • Tries
    • Try
      • Q(B);N_PINP(c),P_PINP(b)
      • Vars
        • P(c);OGATEB,XR(D)::QAR(B)
        • P(c);OGATEB::R(D)
        • P(c);OGATEB::R(D),XP(c)
        • B(d);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • P(b);N_SPINP(c),OGATE,XQ(B)::R1(D)
        • B(d);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(a);
  • Actual
    • Q(B);N_PINP(c),P_PINP(b)
    • Threat
      • QAR2(B),XB(d)
    • Vars
      • P(b);N_SPINP(b),OGATE,XQ(B)::R1(D)
      • P(c);OGATEB,XR(D)::QAR(B)
      • P(c);OGATEB::R(D)
      • P(c);OGATEB::R(D),XP(c)
      • B(d);N_GUARD::QAB1(B),XP(b)
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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).