MESON Chess Problem Database

Problem Display
PID: 48890 (6BB/1n2N3/4N3/1P5R/Qpkbb2R/4P1r1/P1P5/1Kn5 w - - 0 1)

Levman, Semyon Semyonovich

Het Schaakleven, 1932

6BB/1n2N3/4N3/1P5R/Qpkbb2R/4P1r1/P1P5/1Kn5

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Sg7#
    • 1...Bc5
      • 2.Sg5#
    • 1...Bxc2+
      • 2.Qxc2#
    • 1...Sxa2
      • 2.Qb3#
    • 1...Se2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
    • 1...Sd3
      • 2.Qb3#
  • Tries
    • 1.Rc5+?
      • 1...Bxc5
        • 2.Sg5#
      • 1...Sxc5!
  • Keys
    • 1.a3!
      • threat
        • 2.Qxb4#
      • 1...Bxc2+
        • 2.Qxc2#
      • 1...Kc3
        • 2.Qxb4#
      • 1...Bc3
        • 2.Sg7#
      • 1...Bc5
        • 2.Sg5#
      • 1...Sa2
        • 2.Qb3#
      • 1...Sd3
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • B(e);P_SPINB(f),SBLOCK::B(K)+S(I)
    • B(f);CHECK,OGATE,P_SPINB(e),XP(C)::QAR2(E),XB(f)
    • S(a);N_GUARD,XP(B)::QAB1(E)
    • S(a);N_GUARD::QAB1(E)
    • S(a);N_GUARD::QAB1(E),XS(a)
    • S(a);N_GUARD,N_PINP(C)::QAB1(E)
  • Tries
    • Try
      • R(H);CHECK
      • Vars
        • B(e);P_SPINB(f),SBLOCK,XR(H)::B(K)+S(I)
      • Refutation
        • S(g);XR(H)
  • Actual
    • P(B);
    • Threat
      • QAR1(E),XP(c)
    • Vars
      • B(f);CHECK,OGATE,P_SPINB(e),XP(C)::QAR2(E),XB(f)
      • K(d);N_SPINP(c),P-FLIGHT,P_SPINB(e)::QAB1(E),XP(c)
      • B(e);P_SPINB(f),SBLOCK::B(K)+S(I)
      • S(a);N_GUARD::QAB1(E)
      • S(a);N_GUARD,N_PINP(C)::QAB1(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).