MESON Chess Problem Database

Problem Display
PID: 158739 (1n6/5pB1/8/2Nppk1K/5b2/8/5nQ1/8 w - - 0 1)

Peralta, Louis

di Scala, Pascal

Phenix, 1990

1n6/5pB1/8/2Nppk1K/5b2/8/5nQ1/8

#2

4 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bh2
      • 2.Qg5#
    • 1...Bg5
      • 2.Qxg5#
    • 1...Sd1
      • 2.Qh3#
      • 2.Qg4#
    • 1...Sh1
      • 2.Qh3#
      • 2.Qg4#
    • 1...Sd3
      • 2.Qh3#
      • 2.Qg4#
    • 1...Sh3
      • 2.Qxh3#
      • 2.Qg4#
    • 1...Se4
      • 2.Qh3#
      • 2.Qg4#
    • 1...Sg4
      • 2.Qxg4#
    • 1...f6
      • 2.Qg6#
  • Tries
    • 1.Qh3+?
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sxh3!
  • Keys
    • 1.Qxd5!
      • threat
        • 2.Qxf7#
      • 1...Bg5
        • 2.Qxe5#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sg4
        • 2.Qe4#
      • 1...Sd7
        • 2.Qxd7#
      • 1...f6
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(b);N_GUARD::QAR1(A)
    • B(b);N_GUARD::QAR1(A),XB(b)
    • S(a);N_GUARD::QAB1(A),XS(a)
    • P(f);N_GUARD::QAB1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • Q(A);P_PINP(d),XP(c)
    • Threat
      • QAR2(A),XP(f)
    • Vars
      • B(b);N_GUARD::QAR1(A),XP(d)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • S(a);N_GUARD::QAB1(A)
      • S(g);N_GUARD::QAB(A),XS(g)
      • P(f);N_GUARD::QAB1(A)
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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).