MESON Chess Problem Database

Problem Display
PID: 920 (5Rb1/4QpR1/8/5k2/5b2/8/8/1K6 w - - 0 1)

Aleksandrov, Vladimir Aleksandrovich

The Problemist Supplement, 1993

5Rb1/4QpR1/8/5k2/5b2/8/8/1K6

#2

4 + 4

5454 Near Snap 2007
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Bh7
      • 2.Rfxf7#
    • 1...f6
      • 2.Rxf6#
  • Tries
    • 1.Qe4+?
      • 1...Kf6
        • 2.Rg6#
      • 1...Kxe4!
  • Keys
    • 1.Re8!
      • 1...Bc1
        • 2.Qe5#
      • 1...Bd2
        • 2.Qe5#
      • 1...Bh2
        • 2.Qg5#
      • 1...Be3
        • 2.Qe5#
      • 1...Bg3
        • 2.Qg5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bg5
        • 2.Qxg5#
      • 1...Bd6
        • 2.Qg5#
      • 1...Bh6
        • 2.Qe5#
      • 1...Bc7
        • 2.Qg5#
      • 1...Bb8
        • 2.Qg5#
      • 1...Bh7
        • 2.Qxf7#
      • 1...f6
        • 2.Qe4#

Anticipated by 18725(1957)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • B(d);N_GUARD::R(D),XP(c)
    • P(c);OGATE::R1(D),XP(c)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R1(C)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT,XQ(B)
  • Actual
    • R(D);N_PINP(c)
    • Vars
      • B(a);N_GUARD::QAR1(B)
      • B(a);N_GUARD::QAR1(B),XB(a)
      • B(d);N_GUARD::QAR2(B),XP(c)
      • P(c);SBLOCK::QAB1(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).