MESON Chess Problem Database

Problem Display
PID: 25707 (8/r2p2BK/2p1k3/r3bN2/p5Q1/5R2/5p2/3nR3 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

HM., Petrov MT, 1975

8/r2p2BK/2p1k3/r3bN2/p5Q1/5R2/5p2/3nR3

#2

6 + 9

3771 FIDE Album (1974-1976) 1980
2988 Izbrannie Kompozitsi 1985
273 Mat Plus 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Rxe5#
    • 1...Kf7
      • 2.Qg6#
    • 1...Rd5
      • 2.Qg6#
  • Tries
    • 1.Rxe5+?
      • 1...Kf7
        • 2.Se3#
        • 2.Sg3#
        • 2.Sd4#
        • 2.Sh4#
        • 2.Sd6#
        • 2.Sh6#
        • 2.Re7#
        • 2.Qh5#
        • 2.Qg6#
      • 1...Rxe5!
  • Keys
    • 1.Bf8!
      • threat
        • 2.Se3#
      • 1...d5+
        • 2.Sg7#
      • 1...d6+
        • 2.Se7#
      • 1...Kd5
        • 2.Qg8#
      • 1...Kf6
        • 2.Qg6#
      • 1...Kf7
        • 2.Sd6#
      • 1...Se3
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(g);N_SPINB(e),S_FLIGHT::R1(A),XB(e)
    • K(g);N_SPINB(e),S_FLIGHT::QAB1(C)
    • R(d);SBLOCK::QAR2(C)
  • Tries
    • Try
      • R(A);CHECK,XB(e)
      • Refutation
        • R(d);XR(A)
  • Actual
    • B(E);
    • Threat
      • QAB(C)+S(D)
    • Vars
      • P(i);CHECK,SBLOCK::QAB(C)+S(D),DCHECK
      • P(i);CHECK,SBLOCK::QAB(C)+S(D)
      • K(g);N_SPINB(e),S_FLIGHT::QAB(C)
      • K(g);N_SPINB(e),P-FLIGHT::QAR1(C)
      • K(g);N_SPINB(e),S_FLIGHT::R(B)+S(D),DCHECK
      • S(a);N_SPINB(e)::QAB(C)+S(D),XS(a)
HTML5 logo

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).