MESON Chess Problem Database

Problem Display
PID: 103989 (4N3/4P3/1p1Np3/1P1kb1Q1/pR3pp1/P3pnp1/2R1P1B1/5K2 w - - 0 1)

Ulanov, Lev

Fleck-80 JT, 1987

4N3/4P3/1p1Np3/1P1kb1Q1/pR3pp1/P3pnp1/2R1P1B1/5K2

#2

11 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sf5?
      • 1...exf5
        • 2.Qg8#
      • 1...Ba1
        • 2.Sxe3#
      • 1...Bb2
        • 2.Sxe3#
      • 1...Bc3
        • 2.Sxe3#
      • 1...Bd6
        • 2.Sxe3#
      • 1...Bf6
        • 2.Sxe3#
      • 1...Bc7
        • 2.Sxe3#
      • 1...Bg7
        • 2.Sxe3#
      • 1...Bb8
        • 2.Sxe3#
      • 1...Bh8
        • 2.Sxe3#
      • 1...Bd4!
    • 1.Rd2+?
      • 1...Kc5
        • 2.Se4#
        • 2.Sb7#
        • 2.Rc4#
      • 1...exd2!
    • 1.Rb3?
      • threat
        • 2.Rd3#
      • 1...Kd4
        • 2.Rd3#
      • 1...axb3!
    • 1.exf3?
      • 1...gxf3
        • 2.Bxf3#
      • 1...e2+!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sxb6#
        • 2.Qxe5#
      • 1...Kd4
        • 2.Sxb6#
      • 1...Ke4
        • 2.Qxe5#
      • 1...Kc5
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(I);N_PINB(h)
      • Vars
        • P(j);OGATEB,XS(I)::QAB(H)
        • B(h);::QAR(H)+S(I),DCHECK,XP(a)
      • Refutation
        • B(h);
    • Try
      • R(B);CHECK
      • Refutation
        • P(a);XR(B)
    • Try
      • R(F);
      • Threat
        • R(F)
      • Vars
        • K(g);N_SPINB(h),N_SPINS(b),P-FLIGHT::R1(F)
      • Refutation
        • P(d);XR(F)
    • Try
      • P(C);XS(b)
      • Vars
        • P(f);OGATE,P_SPINP(f),XP(C)::B(D),XP(f)
      • Refutation
        • P(a);CHECK
  • Actual
    • S(I);
    • Threat
      • DUALS(2)
    • Vars
      • K(g);N_SPINB(h),N_SPINS(b),P-FLIGHT::R(F)+S(I),XP(i)
      • K(g);N_SPINB(h),S_FLIGHT::QAR1(H),XB(h)
      • K(g);N_SPINS(b),P-FLIGHT::R(B)+S(I),XP(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).