MESON Chess Problem Database

Problem Display
PID: 81151 (1R1B4/1b6/p7/N5rR/kP1Pp3/8/1PP1BP2/2K1Q3 w - - 0 1)

Davidenko, Fedor Vasilevich

2nd Prize, Urania, 1980

1R1B4/1b6/p7/N5rR/kP1Pp3/8/1PP1BP2/2K1Q3

#2

12 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa5
      • 2.Rxa5#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Sb6#
      • 1...Rb5
        • 2.b3#
      • 1...Rg6
        • 2.Ra5#
        • 2.b3#
      • 1...Kb5!
    • 1.Qd1?
      • threat
        • 2.c3#
      • 1...Kxb4
        • 2.c3#
      • 1...Bd5
        • 2.c4#
      • 1...Rg1!
    • 1.c3?
      • threat
        • 2.Qd1#
      • 1...Rg1
        • 2.Bd1#
      • 1...Bd5!
  • Keys
    • 1.Bd1!
      • threat
        • 2.c4#
      • 1...Kb5
        • 2.c4#
      • 1...Rg3
        • 2.c3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(c);OGATE,XS(I)::R1(J),XR(c)
  • Tries
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • R(c);::P(C)
      • Refutation
        • K(a);P_SPINB(e),P_SPINR(c),S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB(B)+P(D)
      • Vars
        • K(a);P-FLIGHT,P_SPINB(e),XP(G)::P(D)
        • B(e);::QAB(B)+P(D)
      • Refutation
        • R(c);P_PINQ(B)
    • Try
      • P(D);
      • Threat
        • QAB(B)
      • Vars
        • R(c);P_PINQ(B)::B(E)
      • Refutation
        • B(e);
  • Actual
    • B(E);
    • Threat
      • B(E)+P(D)
    • Vars
      • K(a);P_SPINB(e),P_SPINR(c),S_FLIGHT::P(D)
      • R(c);::B(E)+P(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).