MESON Chess Problem Database

Problem Display
PID: 109968 (5b2/1p6/p1bpp3/BPR1Q3/rn2p3/1R1pkP2/n1P3P1/1N2NK2 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

Shakhmaty v SSSR, 1976

5b2/1p6/p1bpp3/BPR1Q3/rn2p3/1R1pkP2/n1P3P1/1N2NK2

#2

11 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb5
      • 2.Qxe4#
    • 1...Bd7
      • 2.Qxe4#
    • 1...Be8
      • 2.Qxe4#
    • 1...Sxc2
      • 2.Sxc2#
      • 2.Bd2#
      • 2.Rxd3#
    • 1...Sd5
      • 2.Bd2#
      • 2.Rxd3#
  • Tries
    • 1.Rc4?
      • threat
        • 2.Bb6#
        • 2.Qg5#
      • 1...Rxa5
        • 2.Qg5#
      • 1...Sxc2
        • 2.Sxc2#
        • 2.Bd2#
        • 2.Rxd3#
        • 2.Qg5#
      • 1...Bh6
        • 2.Bb6#
      • 1...Be7
        • 2.Bb6#
      • 1...Sd5
        • 2.Bd2#
        • 2.Rxd3#
        • 2.Qxe4#
      • 1...d5
        • 2.Qg5#
      • 1...b6
        • 2.Bxb6#
        • 2.Qg5#
      • 1...dxe5!
  • Keys
    • 1.Rxd3+!
      • 1...Sxd3
        • 2.Bd2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(h);N_GUARD,XP(I)::QAR1(K),XP(f)
    • B(h);N_GUARD::QAR1(K),XP(f)
  • Tries
    • Try
      • R(J);
      • Threat
        • DUALS(2)
      • Vars
        • R(d);XB(H)::QAB(K)
        • B(l);::B(H)
        • P(i);::QAB(K)
      • Refutation
        • P(i);XQ(K)
  • Actual
    • R(F);CHECK,P_PINP(f),XP(b)
    • Vars
      • S(e);OGATE,XR(F)::B(H)
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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).