MESON Chess Problem Database

Problem Display
PID: 228718 (b3r2b/2p1R1N1/4p2p/2P3P1/2PNk3/6Q1/3R2K1/q1n5 w - - 0 1)

Lobusov, Andrey Jakovlevic

Schweizerische Schachzeitung, 1986

b3r2b/2p1R1N1/4p2p/2P3P1/2PNk3/6Q1/3R2K1/q1n5

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Rxe6#
    • 1...Rc8
      • 2.Rxe6#
    • 1...Rd8
      • 2.Rxe6#
    • 1...Rf8
      • 2.Rxe6#
    • 1...Rg8
      • 2.Rxe6#
    • 1...e5
      • 2.Qxe5#
      • 2.Qf3#
  • Tries
    • 1.Sdxe6?
      • threat
        • 2.Qf4#
      • 1...hxg5
        • 2.Sxg5#
      • 1...Qe5
        • 2.Qf3#
      • 1...Rf8
        • 2.Sd4#
      • 1...Se2
        • 2.Rxe2#
      • 1...Sd3
        • 2.Re2#
      • 1...Qf6!
  • Keys
    • 1.Sgxe6!
      • threat
        • 2.Qf4#
      • 1...hxg5
        • 2.Sxg5#
      • 1...Rf8
        • 2.Sg7#
      • 1...Be5
        • 2.Qf3#
      • 1...Se2
        • 2.Rxe2#
      • 1...Sd3
        • 2.Re2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(h);N_GUARD::R(H),XP(d)
  • Tries
    • Try
      • S(E);XP(d)
      • Threat
        • QAR1(C)
      • Vars
        • P(e);XP(G)::R(H)+S(E),DCHECK,XP(e)
        • Q(a);SBLOCK::QAB1(C)
        • R(h);N_GUARD::R(H)+S(E)
        • S(b);N_GUARD::R(A),XS(b)
        • S(b);N_GUARD::R(A)
      • Refutation
        • Q(a);
  • Actual
    • S(I);XP(d)
    • Threat
      • QAR1(C)
    • Vars
      • P(e);XP(G)::R(H)+S(I),DCHECK,XP(e)
      • R(h);N_GUARD::R(H)+S(I)
      • B(i);SBLOCK::QAB1(C)
      • S(b);N_GUARD::R(A),XS(b)
      • S(b);N_GUARD::R(A)
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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).