MESON Chess Problem Database

Problem Display
PID: 248416 (5b2/Q7/2p3p1/2R3N1/3k4/1n2N3/2P2K2/5b2 w - - 0 1)

Ulanov, Leonid

2nd Prize, Novi Sad Olympic Ty., 1990

5b2/Q7/2p3p1/2R3N1/3k4/1n2N3/2P2K2/5b2

#2

6 + 6

14867 BCPS Library 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.c3#
    • 1...Bxc5
      • 2.Qg7#
    • 1...Sxc5
      • 2.Qa1#
  • Tries
    • 1.Rxc6+?
      • 1...Bc5
        • 2.Qg7#
      • 1...Sc5
        • 2.Qa1#
      • 1...Ke5!
    • 1.Qa4+?
      • 1...Bc4
        • 2.Qxc4#
      • 1...Kxc5!
    • 1.Qd7+?
      • 1...Bd6
        • 2.Qxd6#
      • 1...Kxc5!
    • 1.Qe7?
      • threat
        • 2.Sf3#
        • 2.Qe5#
      • 1...Sxc5
        • 2.Qf6#
      • 1...Bc4
        • 2.Rxc4#
        • 2.Qe5#
      • 1...Be2
        • 2.Qe5#
      • 1...Bg2
        • 2.Rc4#
        • 2.Qe5#
      • 1...Bg7
        • 2.Sf3#
        • 2.Qd6#
      • 1...Sd2
        • 2.Qe5#
      • 1...Bxe7!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qe5#
      • 1...Kxc5
        • 2.Se6#
      • 1...Bxc5
        • 2.Qh8#
      • 1...Sxc5
        • 2.Qb2#
      • 1...Bd6
        • 2.Qxd6#
      • 1...Bg7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::P(A)
    • B(f);N_GUARD,P_SPINB(f),SBLOCK,XR(D)::QAB(F)
    • S(b);N_GUARD,P_SPINS(b),SBLOCK,XR(D)::QAB(F)
  • Tries
    • Try
      • R(D);CHECK,XP(d)
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAB(F)
        • S(b);N_GUARD,P_SPINS(b)::QAB(F)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(F),XB(a)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • Q(F);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAR2(F),XB(f)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);SBLOCK,XR(D)::QAB(F)
        • B(a);::QAB1(F)
        • S(b);::QAB1(F)
      • Refutation
        • B(f);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • K(c);S_FLIGHT,XR(D)::S(E)
      • B(f);OGATE,SBLOCK,XR(D)::QAB(F)
      • S(b);OGATE,SBLOCK,XR(D)::QAB(F)
      • B(f);N_GUARD::QAR2(F),XB(f)
      • B(f);N_GUARD::QAR2(F)
HTML5 logo

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).