MESON Chess Problem Database

Problem Display
PID: 273777 (2N5/5n2/4ppn1/2p2k2/6R1/7P/1QK1N2b/4R3 w - - 0 1)

Smith, James Alfred John

The Problemist, 1932

2N5/5n2/4ppn1/2p2k2/6R1/7P/1QK1N2b/4R3

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Sg3#
    • 1...Bg3
      • 2.Sxg3#
    • 1...Sh4
      • 2.Se7#
    • 1...Sge5
      • 2.Se7#
    • 1...Se7
      • 2.Sxe7#
    • 1...Sf8
      • 2.Se7#
    • 1...Sgh8
      • 2.Se7#
    • 1...Sfe5
      • 2.Sd6#
    • 1...c4
      • 2.Sd4#
  • Tries
    • 1.Rf1+?
      • 1...Bf4
        • 2.Sg3#
      • 1...Sf4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Sd4#
      • 1...Ke5
        • 2.Qxc5#
      • 1...Bg1
        • 2.Sg3#
      • 1...Be5
        • 2.Qd3#
      • 1...Sge5
        • 2.Se7#
      • 1...Sfe5
        • 2.Sd6#
      • 1...e5
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • B(a);N_GUARD::S(D)
    • B(a);N_GUARD::S(D),XB(a)
    • S(f);N_GUARD::S(G)
    • S(f);N_GUARD::S(G),XS(f)
    • S(g);N_GUARD,S_CUTB(a)::S(G)
    • P(b);N_GUARD::S(D)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • B(a);P_SPINB(a)::S(D)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • Q(B);P_PINP(b)
    • Threat
      • S(D)
    • Vars
      • K(c);P-FLIGHT,S_CUTB(a),S_CUTP(d),S_CUTS(f),S_CUTS(g)::QAR2(B),XP(b)
      • B(a);N_GUARD::S(D)
      • B(a);N_SPINP(b),SBLOCK::QAB(B)
      • S(f);N_GUARD,N_SPINP(b),SBLOCK::S(G)
      • S(g);N_GUARD,N_SPINP(b),SBLOCK,S_CUTB(a)::S(G)
      • P(d);N_SPINP(b),OGATEB,SBLOCK::QAB(B)
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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).