MESON Chess Problem Database

Problem Display
PID: 269028 (8/4K1N1/2b1pP2/5Pp1/RNQ1qkp1/1p1B2p1/3P1nP1/B7 w - - 0 1)

Katsnelson, Leonard Ilich

Shakhmatnaya kompozitsiya, 1997

8/4K1N1/2b1pP2/5Pp1/RNQ1qkp1/1p1B2p1/3P1nP1/B7

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4
      • 2.Sh5#
    • 1...Sxd3
      • 2.Sxd3#
    • 1...exf5+
      • 2.Se6#
  • Tries
    • 1.Sxc6?
      • threat
        • 2.Be5#
      • 1...Sxd3
        • 2.Qxe4#
      • 1...Qd4
        • 2.Sh5#
        • 2.Sxe6#
      • 1...e5
        • 2.Bxe5#
      • 1...b2!
  • Keys
    • 1.Qxe6!
      • threat
        • 2.Sh5#
      • 1...Qxb4+
        • 2.Qd6#
      • 1...Qxe6+
        • 2.Sxe6#
      • 1...Qxg2
        • 2.Qe3#
      • 1...Be8
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(d);N_SPINQ(d),XQ(G)::S(K)
    • S(a);XB(D)::S(F),XS(a)
    • P(i);CHECK,SBLOCK,XP(H)::S(K)
  • Tries
    • Try
      • S(F);XB(h)
      • Threat
        • B(A)
      • Vars
        • S(a);N_GUARD,XB(D)::QAR1(G),XQ(d)
        • P(i);::B(A),XP(i)
      • Refutation
        • P(b);
  • Actual
    • Q(G);N_PINQ(d),P_SPINQ(G),XP(i)
    • Threat
      • S(K)
    • Vars
      • Q(d);CHECK,N_PINQ(G),P_SPINQ(d),XS(F)::QAB(G)
      • Q(d);CHECK,XQ(G)::S(K),XQ(d)
      • Q(d);N_PINQ(G),XP(C)::QAB1(G)
      • B(h);N_GUARD::S(F)
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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).