MESON Chess Problem Database

Problem Display
PID: 167090 (k4n2/Br6/2K5/8/8/4Q3/8/7B w - - 0 1)

Gavriliv, Evgeni M

Sp. Comm., Dieprovsky Metallurg, 1979

k4n2/Br6/2K5/8/8/4Q3/8/7B

#2

4 + 3

145 StrateGems 2016
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Kxb5#
    • 1...Rb6+
      • 2.Kxb6#
    • 1...Rxa7
      • 2.Qe8#
    • 1...Rc7+
      • 2.Kxc7#
  • Tries
    • 1.Qe8+?
      • 1...Rb8
        • 2.Qxb8#
      • 1...Kxa7!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qxb7#
      • 1...Rxb6+
        • 2.Kxb6#
      • 1...Rc7+
        • 2.Kxc7#
      • 1...Rxa7
        • 2.Qd8#
      • 1...Rd7
        • 2.Qb8#
      • 1...Re7
        • 2.Qb8#
      • 1...Rf7
        • 2.Qb8#
      • 1...Rg7
        • 2.Qb8#
      • 1...Rh7
        • 2.Qb8#
      • 1...Rb8
        • 2.Qxb8#

Anticipated by 76193(1943)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(a);::B(A)+K(C),XR(a)
    • R(a);CHECK::B(A)+K(C),XR(a)
    • R(a);N_GUARD,SBLOCK,XB(D)::QAR(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(B),XR(a)
      • Refutation
        • K(b);P-FLIGHT,XB(D)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XR(a)
    • Vars
      • R(a);CHECK,XQ(B)::B(A)+K(C),XR(a)
      • R(a);CHECK::B(A)+K(C),XR(a)
      • R(a);N_GUARD,SBLOCK,XB(D)::QAR(B)
      • R(a);OGATE::QAR1(B)
      • R(a);OGATE,SBLOCK::QAR1(B)
      • R(a);OGATE::QAR1(B),XR(a)
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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).