MESON Chess Problem Database

Problem Display
PID: 146209 (1R6/b1rp2p1/2k1n2R/K3BN1r/bP1pPpnq/3N1Bpp/8/8 w - - 0 1)

Isaev, Leonid Antonovich

1st Prize, Zadachi i Etyudi, 1930

1R6/b1rp2p1/2k1n2R/K3BN1r/bP1pPpnq/3N1Bpp/8/8

#2

9 + 14

14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Sxe7#
    • 1...Rg5
      • 2.Se7#
    • 1...Bd1
      • 2.b5#
    • 1...Bc2
      • 2.b5#
    • 1...Bb3
      • 2.b5#
    • 1...Bb6+
      • 2.Rxb6#
    • 1...Sxe5
      • 2.Sxe5#
    • 1...Sf6
      • 2.Se7#
    • 1...g5
      • 2.Se7#
  • Tries
    • 1.Rxe6+?
      • 1...d6
        • 2.Rxd6#
      • 1...dxe6!
  • Keys
    • 1.Bd6!
      • threat
        • 2.e5#
      • 1...Bb6+
        • 2.Rxb6#
      • 1...Bd1
        • 2.b5#
      • 1...Bb3
        • 2.b5#
      • 1...Sf2
        • 2.Se5#
      • 1...Sh2
        • 2.Se5#
      • 1...Se3
        • 2.Se5#
      • 1...Se5
        • 2.Sxe5#
      • 1...Sf6
        • 2.Se5#
      • 1...Sc5
        • 2.Sxd4#
      • 1...Sg5
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(g);N_GUARD::S(G),XQ(g)
    • R(h);S_CUTQ(g)::S(G)
    • B(c);N_GUARD::P(C)
    • B(k);CHECK,N_GUARD::R1(I),XB(k)
    • S(f);XB(F)::S(A),XS(f)
    • S(f);N_SPINS(j),S_CUTQ(g)::S(G)
    • P(n);S_CUTQ(g)::S(G)
  • Tries
    • Try
      • R(H);CHECK,XS(j)
      • Vars
        • P(m);P_SPINP(m)::R1(H),XP(m)
      • Refutation
        • P(m);XR(H)
  • Actual
    • B(F);N_PINS(j),P_SPINS(G)
    • Threat
      • B(B)+P(D)
    • Vars
      • B(k);CHECK,N_GUARD::R1(I),XB(k)
      • B(c);N_GUARD::P(C)
      • S(f);N_GUARD::S(A)
      • S(f);N_GUARD,N_PINS(G)::S(A),XS(f)
      • S(j);N_PINS(G)::S(G),XP(d)
      • S(j);N_PINS(G)::S(G)
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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).