MESON Chess Problem Database

Problem Display
PID: 273028 (1nrB4/b4Qp1/R3P1n1/3p2rp/1N1k2P1/2p3P1/1RpNBP1K/1q3b2 w - - 0 1)

Krivenko, Valery Aleksinovich

Springaren, 1989

1nrB4/b4Qp1/R3P1n1/3p2rp/1N1k2P1/2p3P1/1RpNBP1K/1q3b2

#2

12 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qxa7#
    • 1...Ke5
      • 2.Qxg7#
  • Tries
    • 1.Sf3+?
      • 1...Kc5
        • 2.Qxa7#
      • 1...Ke4!
    • 1.Sxc2+?
      • 1...Kc5
        • 2.Sb3#
        • 2.Qxa7#
      • 1...Ke5
        • 2.Qxg7#
      • 1...Qxc2!
    • 1.Qf4+?
      • 1...Kc5
        • 2.Sb3#
        • 2.Sd3#
        • 2.Ra5#
      • 1...Sxf4!
    • 1.Qxa7+?
      • 1...Ke5
        • 2.Sd3#
        • 2.Qe3#
        • 2.Qxg7#
      • 1...Rc5!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qe3#
      • 1...Kc5
        • 2.Qxc3#
      • 1...Ke5
        • 2.Qxd5#
      • 1...Re5
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(e);N_GUARD,S_CUTR(m),S_FLIGHT::QAB(K),XB(j)
    • K(e);N_GUARD,S_CUTR(g),S_CUTS(i),S_FLIGHT::QAB(K),XP(k)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(e);N_GUARD,S_FLIGHT::QAB(K),XB(j)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • S(G);CHECK,XP(c)
      • Vars
        • K(e);N_GUARD,S_FLIGHT::QAB(K),XP(k)
      • Refutation
        • Q(a);XS(G)
    • Try
      • Q(K);CHECK
      • Refutation
        • S(i);XQ(K)
    • Try
      • Q(K);CHECK,XB(j)
      • Refutation
        • R(m);P_SPINR(m)
  • Actual
    • Q(K);
    • Threat
      • QAB1(K)
    • Vars
      • K(e);N_GUARD,S_CUTR(m),S_FLIGHT::QAR2(K),XP(d)
      • K(e);S_CUTR(g),S_FLIGHT::QAR1(K),XP(f)
      • R(g);SBLOCK::S(B)
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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).