MESON Chess Problem Database

Problem Display
PID: 220521 (n1R1B3/2b1p3/np3p2/1pk5/8/PP3pQ1/1N1R1P1K/8 w - - 0 1)

Leontieva, Nadezhda Aleksandrovna

Freie Presse, 1976

n1R1B3/2b1p3/np3p2/1pk5/8/PP3pQ1/1N1R1P1K/8

#2

9 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sb8
      • 2.b4#
    • 1...b4
      • 2.Sa4#
    • 1...f5
      • 2.Qe5#
    • 1...e6
      • 2.Qd6#
  • Tries
    • 1.Rxc7+?
      • 1...S6xc7
        • 2.b4#
      • 1...S8xc7!
    • 1.Qxc7+?
      • 1...S6xc7
        • 2.b4#
      • 1...S8xc7!
  • Keys
    • 1.Qf4!
      • 1...Sb4
        • 2.axb4#
      • 1...Sb8
        • 2.b4#
      • 1...b4
        • 2.Sa4#
      • 1...f5
        • 2.Qe5#
      • 1...e5
        • 2.Qe3#
      • 1...e6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::P(F)
    • P(b);N_GUARD::S(A)
    • P(f);N_GUARD::QAR2(G)
    • P(h);N_GUARD::QAB1(G)
  • Tries
    • Try
      • R(H);CHECK,N_SPINQ(G),XB(g)
      • Vars
        • S(d);XR(H)::P(F)
      • Refutation
        • S(i);XR(H)
    • Try
      • Q(G);CHECK,N_SPINQ(G),XB(g)
      • Vars
        • S(d);P_SPINS(d),XQ(G)::P(F)
      • Refutation
        • S(i);P_SPINS(i),XQ(G)
  • Actual
    • Q(G);
    • Vars
      • S(d);OGATE::P(E),XS(d)
      • S(d);N_GUARD::P(F)
      • P(b);N_GUARD::S(A)
      • P(f);N_GUARD::QAR2(G)
      • P(h);N_PINQ(G)::QAB(G)
      • P(h);N_GUARD::QAB1(G)
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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).