MESON Chess Problem Database

Problem Display
PID: 108888 (3bRQBN/r7/3PP3/4kpP1/RN1n1n2/B3PP2/8/3K4 w - - 0 1)

Lider, Valentin Viktorovich

Northwest Chess, 1978

3bRQBN/r7/3PP3/4kpP1/RN1n1n2/B3PP2/8/3K4

#2

13 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa4
      • 2.Sf7#
    • 1...Ra5
      • 2.Sf7#
    • 1...Ra6
      • 2.Sf7#
    • 1...Rf7
      • 2.Sxf7#
    • 1...Ra8
      • 2.Sf7#
    • 1...Bc7
      • 2.Sf7#
    • 1...Sdxe6
      • 2.Bb2#
    • 1...Se2
      • 2.Sg6#
    • 1...Sg2
      • 2.Sg6#
    • 1...Sd3
      • 2.Sg6#
    • 1...Sh3
      • 2.Sg6#
    • 1...Sd5
      • 2.Sd3#
      • 2.Sg6#
    • 1...Sh5
      • 2.Sg6#
    • 1...Sfxe6
      • 2.Sg6#
    • 1...Sg6
      • 2.Sxg6#
  • Tries
    • 1.Ra5+?
      • 1...Rxa5
        • 2.Sf7#
      • 1...Sb5
        • 2.Bb2#
      • 1...Sd5
        • 2.Sd3#
        • 2.Sg6#
        • 2.Rxd5#
      • 1...Bxa5!
  • Keys
    • 1.e7!
      • threat
        • 2.Qf6#
      • 1...Kxd6
        • 2.exd8Q#
      • 1...Sxf3
        • 2.Sc6#
      • 1...Sde6
        • 2.Sf7#
      • 1...Sd5
        • 2.Sd3#
      • 1...Sh5
        • 2.Sd3#
      • 1...Sfe6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • R(e);N_GUARD,XR(E)::S(M)
    • R(e);N_GUARD::S(M)
    • R(e);N_GUARD::S(M),XR(e)
    • B(f);S_CUTR(e)::S(M)
    • S(a);OGATEB,P_SPINS(a),XP(I)::B(B)
    • S(b);N_GUARD::S(M)
    • S(b);N_GUARD,P_SPINS(b),XP(I)::S(M)
    • S(b);N_GUARD::S(M),XS(b)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • R(e);XR(E)::S(M)
        • S(a);P_SPINS(a),S_CUTB(f),S_CUTR(e),S_CUTS(b)::B(B)
      • Refutation
        • B(f);XR(E)
  • Actual
    • P(I);
    • Threat
      • QAB1(K)
    • Vars
      • K(c);S_FLIGHT,XP(H)::PXB(f)=Q
      • S(a);N_GUARD,XP(D)::S(F)
      • S(a);SBLOCK::S(M)
      • S(b);N_GUARD::S(F)
      • S(b);SBLOCK::S(M)
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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).