MESON Chess Problem Database

Problem Display
PID: 286482 (3R4/3p3B/2pp1N2/2p2n2/K1k5/2P2P2/6R1/3N4 w - - 0 1)

Koshel, Mikhail Igorevich

64 Shakhmatnoe obozrenie, 2026

3R4/3p3B/2pp1N2/2p2n2/K1k5/2P2P2/6R1/3N4

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sh4
      • 2.Rg4#
    • 1...Se7
      • 2.Rg4#
    • 1...Sg7
      • 2.Rg4#
  • Tries
    • 1.Sg4?
      • 1...Kd5
        • 2.Bg8#
      • 1...Se3
        • 2.Sgxe3#
      • 1...Sg3
        • 2.Sge3#
      • 1...Sd4
        • 2.Sge3#
      • 1...Sh4
        • 2.Sge3#
      • 1...Sh6
        • 2.Sge3#
      • 1...Se7
        • 2.Sge3#
      • 1...Sg7
        • 2.Sge3#
      • 1...d5
        • 2.Se5#
      • 1...Kd3!
    • 1.Rd2?
      • 1...Se3
        • 2.Bd3#
      • 1...Sg3
        • 2.Bd3#
      • 1...Sd4
        • 2.Bd3#
      • 1...Sh4
        • 2.Bd3#
      • 1...Sh6
        • 2.Bd3#
      • 1...Se7
        • 2.Bd3#
      • 1...Sg7
        • 2.Bd3#
      • 1...d5!
  • Keys
    • 1.Sxd7!
      • 1...Kd3
        • 2.Se5#
      • 1...Kd5
        • 2.Bg8#
      • 1...Se3
        • 2.Sb6#
      • 1...Sg3
        • 2.Sb6#
      • 1...Sd4
        • 2.Sb6#
      • 1...Sh4
        • 2.Sb6#
      • 1...Sh6
        • 2.Sb6#
      • 1...Se7
        • 2.Sb6#
      • 1...Sg7
        • 2.Sb6#
      • 1...d5
        • 2.Se5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::R(B)
  • Tries
    • Try
      • S(F);
      • Vars
        • K(a);N_GUARD,S_CUTP(e),S_FLIGHT::B(G)
        • S(c);N_GUARD::S(F),XS(c)
        • S(c);N_GUARD::S(F)
        • P(e);N_GUARD,SBLOCK::S(F)
      • Refutation
        • K(a);P_SPINS(c),S_FLIGHT
    • Try
      • R(B);
      • Vars
        • S(c);OGATE::B(G)
      • Refutation
        • P(e);
  • Actual
    • S(F);XP(f)
    • Vars
      • K(a);N_GUARD,P_SPINS(c),S_CUTP(e),S_FLIGHT::S(F)
      • K(a);N_GUARD,S_CUTP(e),S_FLIGHT::B(G)
      • S(c);::S(F)
      • P(e);N_GUARD::S(F)
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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).