MESON Chess Problem Database

Problem Display
PID: 91484 (K7/7Q/2p2P1R/2b1k1p1/3p1Nr1/1R4B1/B7/7q w - - 0 1)

Kofman, Rafael Moiseevich

Probleemblad, 1970

K7/7Q/2p2P1R/2b1k1p1/3p1Nr1/1R4B1/B7/7q

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qe7#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Rb1#
        • 2.Rb2#
        • 2.Ra3#
        • 2.Rc3#
        • 2.Rb4#
        • 2.Rb5#
        • 2.Rb6#
        • 2.Rb7#
        • 2.Rb8#
      • 1...Ke6!
    • 1.Re3+?
      • 1...Kd6
        • 2.Re6#
        • 2.Qe7#
      • 1...Qe4
        • 2.Sd3#
      • 1...dxe3!
    • 1.Qe7+?
      • 1...Kf5
        • 2.Qe6#
      • 1...Bxe7!
  • Keys
    • 1.Sg6+!
      • 1...Ke4
        • 2.Se7#
      • 1...Kd5
        • 2.Re3#
      • 1...Kf5
        • 2.Sf8#
      • 1...Ke6
        • 2.Rf3#
      • 1...Kxf6
        • 2.Sh4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • K(e);S_FLIGHT::QAB1(G)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • R(B);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::B(C)+S(D),DCHECK
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(G);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB1(G)
      • Refutation
        • B(d);XQ(G)
  • Actual
    • S(D);CHECK
    • Vars
      • K(e);P-FLIGHT::QAB(G)+S(D)
      • K(e);P-FLIGHT::B(A)+R(B)
      • K(e);S_FLIGHT,XP(E)::R(F)+S(D)
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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).