MESON Chess Problem Database

Problem Display
PID: 12404 (B7/8/kp6/N7/8/8/2KB4/1Q6 w - - 0 1)

Aliovsadzade, Rauf Gadzhiaga ogli

Vahidov, Medzhnun

Sp. HM., Vilna Ukraina, 1978

B7/8/kp6/N7/8/8/2KB4/1Q6

#2

5 + 2

3296 Shakhmatny zadachi miniaturi 1987
145 StrateGems 2003
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...bxa5
      • 2.Qb7#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Qxb6#
      • 1...b5
        • 2.Qa2#
        • 2.Qa1#
      • 1...Ka7!
    • 1.Qa1?
      • 1...Ka7
        • 2.Sc6#
      • 1...bxa5
        • 2.Qxa5#
      • 1...b5
        • 2.Sc4#
      • 1...Kb5!
    • 1.Qh1?
      • 1...Ka7
        • 2.Qb7#
      • 1...bxa5
        • 2.Qb7#
      • 1...b5
        • 2.Qb7#
      • 1...Kb5!
  • Keys
    • 1.Qa2!
      • 1...Kb5
        • 2.Qc4#
      • 1...Ka7
        • 2.Sc6#
      • 1...bxa5
        • 2.Qxa5#
      • 1...b5
        • 2.Sc4#

Anticipated by 21309(1918), 77239(1927), 102513(1964)

This anticipates 150698(1982), 79321(1988), 203054(1990), 245207(2000)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE,XS(D)::QAB1(A)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR1(A),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR(A)+S(D),DCHECK
        • P(b);OGATE,P_SPINP(b),XS(D)::QAR1(A),XP(b)
        • P(b);SBLOCK::QAR(A)+S(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
        • P(b);XS(D)::QAB1(A)
        • P(b);::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);P-FLIGHT::QAR(A)+S(D),DCHECK
      • P(b);OGATE,P_SPINP(b),XS(D)::QAR1(A),XP(b)
      • P(b);SBLOCK::QAR(A)+S(D)
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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).