MESON Chess Problem Database

Problem Display
PID: 93377 (5B2/4N3/1pP4r/qpk1pP2/n2N4/1ppQp3/1P2r2p/3R1B1K w - - 0 1)

Kofman, Rafael Moiseevich

Match: Netherlands - USSR, 1955

5B2/4N3/1pP4r/qpk1pP2/n2N4/1ppQp3/1P2r2p/3R1B1K

#2

10 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kb4
      • 2.Sd5#
    • 1...Kd6
      • 2.Se6#
    • 1...b4
      • 2.Sxb3#
    • 1...exd4
      • 2.Qxd4#
  • Tries
    • 1.Se6+?
      • 1...Kb4
        • 2.Sd5#
        • 2.Qe4#
      • 1...Rxe6!
    • 1.Qxb5+?
      • 1...Kd6
        • 2.Sd5#
      • 1...Qxb5!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Sxb3#
      • 1...Kb4
        • 2.Se6#
      • 1...Kc4
        • 2.Se6#
      • 1...Kd6
        • 2.Sd5#
      • 1...Rxb2
        • 2.Sg6#
      • 1...exd4
        • 2.Qxd4#
      • 1...Qb4
        • 2.Qd5#
      • 1...Rd2
        • 2.Sg6#
      • 1...b4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(i);S_FLIGHT::B(J)+S(I),DCHECK
    • K(i);S_FLIGHT::QAR(E)+S(F)
    • P(h);SBLOCK::S(F),XP(c)
    • P(j);OGATE,XS(F)::QAB1(E),XP(j)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • R(l);XS(F)
    • Try
      • Q(E);CHECK,XP(h)
      • Vars
        • K(i);S_FLIGHT::B(J)+S(I)
      • Refutation
        • Q(g);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • S(F),XP(c)
    • Vars
      • K(i);S_FLIGHT::QAR(E)+S(F)
      • K(i);P-FLIGHT,P_SPINR(a)::QAR(E)+S(F)
      • K(i);S_FLIGHT::B(J)+S(I)
      • R(a);XP(D)::B(J)+S(I)
      • P(j);OGATE,XS(F)::QAB1(E),XP(j)
      • Q(g);SBLOCK::QAR1(E)
      • R(a);::B(J)+S(I)
      • P(h);SBLOCK::QAR1(E)
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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).