MESON Chess Problem Database

Problem Display
PID: 266470 (1BQn4/2prP2K/Ppk1p3/p2NP3/1pB5/1N1P4/P3P3/2R5 w - - 0 1)

Lider, Valentin Viktorovich

4th Prize, Mat, 1977

1BQn4/2prP2K/Ppk1p3/p2NP3/1pB5/1N1P4/P3P3/2R5

#2

13 + 8

261 Mat 1980

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Qxc7#
    • 1...Rd6
      • 2.Qxc7#
    • 1...Rxe7+
      • 2.Sxe7#
    • 1...Sb7
      • 2.Qxb7#
    • 1...Sf7
      • 2.Qb7#
    • 1...a4
      • 2.Sxb4#
  • Tries
    • 1.a4?
      • 1...Rxe7+
        • 2.Sxe7#
      • 1...Rxd5
        • 2.Bb5#
        • 2.Qxc7#
      • 1...exd5
        • 2.Bb5#
      • 1...b5
        • 2.axb5#
      • 1...Rd6
        • 2.Qxc7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qb7#
      • 1...bxa4 ep!
    • 1.a7?
      • 1...Rxe7+
        • 2.Sxe7#
      • 1...Rxd5
        • 2.Qxc7#
      • 1...exd5
        • 2.Ba6#
      • 1...b5
        • 2.Qa6#
      • 1...Rd6
        • 2.Qxc7#
      • 1...Sf7
        • 2.a8Q#
        • 2.a8B#
      • 1...a4
        • 2.Sxb4#
      • 1...Sb7!
  • Keys
    • 1.d4!
      • 1...Rxe7+
        • 2.Sxe7#
      • 1...Rxd5
        • 2.Qxc7#
      • 1...exd5
        • 2.Bd3#
      • 1...b5
        • 2.Sxa5#
      • 1...Rd6
        • 2.Qxc7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qb7#
      • 1...a4
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(g);N_GUARD,N_PINP(J),XS(G)::QAR1(M),XP(f)
    • R(g);N_GUARD,N_PINP(J)::QAR1(M),XP(f)
    • R(g);CHECK,XP(J)::S(G),XR(g)
    • S(h);N_GUARD::QAB1(M),XS(h)
    • S(h);N_GUARD,N_PINP(J)::QAB1(M)
    • P(b);N_GUARD::S(G),XP(a)
  • Tries
    • Try
      • P(B);
      • Vars
        • R(g);CHECK,XP(J)::S(G),XR(g)
        • P(e);SBLOCK,XS(G)::R(A)+B(F),DCHECK
        • P(c);OGATE::P(B),XP(c)
        • R(g);N_GUARD,N_PINP(J)::QAR1(M),XP(f)
        • S(h);N_GUARD::QAB1(M),XS(h)
        • S(h);N_GUARD,N_PINP(J)::QAB1(M)
      • Refutation
        • P(a);EP,XP(B)
    • Try
      • P(I);
      • Vars
        • R(g);CHECK,XP(J)::S(G),XR(g)
        • R(g);N_GUARD,N_PINP(J),XS(G)::QAR1(M),XP(f)
        • P(e);SBLOCK,XS(G)::R(A)+B(F)
        • P(c);OGATEB::QAR2(M)
        • R(g);N_GUARD,N_PINP(J)::QAR1(M),XP(f)
        • S(h);N_GUARD,N_PINP(J)::P=Q
        • P(b);N_GUARD::S(G),XP(a)
      • Refutation
        • S(h);
  • Actual
    • P(E);
    • Vars
      • R(g);CHECK,XP(J)::S(G),XR(g)
      • R(g);N_GUARD,N_PINP(J),XS(G)::QAR1(M),XP(f)
      • P(e);SBLOCK,XS(G)::R(A)+B(F)
      • P(c);N_GUARD::S(D),XP(b)
      • R(g);N_GUARD,N_PINP(J)::QAR1(M),XP(f)
      • S(h);N_GUARD::QAB1(M),XS(h)
      • S(h);N_GUARD,N_PINP(J)::QAB1(M)
      • P(b);N_GUARD::S(G),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).