MESON Chess Problem Database

Problem Display
PID: 179077 (B2K3n/3N4/3kP3/4RPN1/2pr4/8/3nQ3/2bR3b w - - 0 1)

Levman, Semyon Semyonovich

Magasinet, 1932

B2K3n/3N4/3kP3/4RPN1/2pr4/8/3nQ3/2bR3b

#2

9 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Rd5#
    • 1...Sf3
      • 2.Se4#
    • 1...Se4
      • 2.Rxd4#
    • 1...Sg6
      • 2.Sf7#
    • 1...Sf7+
      • 2.Sxf7#
  • Tries
    • 1.Se4+?
      • 1...Rxe4
        • 2.Rd5#
      • 1...Sxe4
        • 2.Rxd4#
      • 1...Bxe4!
    • 1.Rd5+?
      • 1...Bxd5
        • 2.Qe5#
      • 1...Rxd5!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Qe5#
      • 1...Sf7+
        • 2.Sxf7#
      • 1...Re4
        • 2.Rd5#
      • 1...Rd5
        • 2.Rc6#
      • 1...Be4
        • 2.Qh2#
      • 1...Sf3
        • 2.Se4#
      • 1...Se4
        • 2.Rxd4#
      • 1...Sg6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(e);N_GUARD,P_SPINS(c),S_CUTB(b)::R1(C)
    • S(c);N_GUARD,P_SPINR(e),S_CUTB(b)::S(E)
    • S(c);OGATE,P_SPINR(e)::R(A),XR(e)
    • S(g);N_GUARD::S(E)
    • S(g);CHECK,N_GUARD::S(E),XS(g)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • R(e);P_SPINS(c),XS(E)::R1(C)
        • S(c);OGATE,P_SPINR(e),XS(E)::R(A),XR(e)
      • Refutation
        • B(b);XS(E)
    • Try
      • R(C);CHECK
      • Vars
        • B(b);XR(C)::QAB1(B)
      • Refutation
        • R(e);XR(C)
  • Actual
    • R(C);
    • Threat
      • QAB1(B)
    • Vars
      • S(g);CHECK,N_GUARD::S(E),XS(g)
      • R(e);N_GUARD,P_SPINS(c),S_CUTB(b)::R1(C)
      • R(e);SBLOCK,S_CUTB(b)::R1(C)
      • B(b);S_CUTR(e)::QAB(B)
      • S(c);N_GUARD,P_SPINR(e),S_CUTB(b)::S(E)
      • S(c);OGATE,P_SPINR(e)::R(A),XR(e)
      • S(g);N_GUARD::S(E)
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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).