MESON Chess Problem Database

Problem Display
PID: 1039 (8/5p1n/3Q4/5K1k/7p/8/8/6R1 w - - 0 1)

Kovalenko, Vitaly Semenovich

The Problemist Supplement, 1998

8/5p1n/3Q4/5K1k/7p/8/8/6R1

#2

3 + 4

3666 Problem Paradise 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Sg5
      • 2.Rxg5#
    • 1...Sf8
      • 2.Rg5#
  • Tries
    • 1.Rg6?
      • threat
        • 2.Rh6#
        • 2.Qd1#
      • 1...fxg6+
        • 2.Qxg6#
      • 1...h3
        • 2.Rh6#
      • 1...Sg5
        • 2.Rxg5#
        • 2.Rh6#
      • 1...f6
        • 2.Qd1#
      • 1...Sf6!
    • 1.Rg7?
      • threat
        • 2.Rxh7#
      • 1...Sg5
        • 2.Rxg5#
      • 1...Sf8
        • 2.Rg5#
      • 1...Sf6!
  • Keys
    • 1.Qg3!
      • 1...Kh6
        • 2.Qxh4#
      • 1...hxg3
        • 2.Rh1#
      • 1...Sf6
        • 2.Qg5#
      • 1...Sg5
        • 2.Qxg5#
      • 1...Sf8
        • 2.Qg5#
      • 1...h3
        • 2.Qxh3#
      • 1...f6
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::R1(A),XS(d)
    • S(d);N_GUARD::R1(A)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);CHECK,OGATE,XR(A)::QAB1(C),XP(c)
        • P(a);::R1(A)
        • P(c);::QAB(C)
      • Refutation
        • S(d);
    • Try
      • R(A);
      • Threat
        • R(A),XS(d)
      • Vars
        • S(d);N_GUARD::R1(A),XS(d)
        • S(d);N_GUARD::R1(A)
      • Refutation
        • S(d);
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT::QAR2(C),XP(a)
      • P(a);OGATEB,XQ(C)::R(A)
      • S(d);N_GUARD::QAR1(C)
      • S(d);N_GUARD::QAR1(C),XS(d)
      • P(a);OGATEB::QAR2(C),XP(a)
      • P(c);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).