MESON Chess Problem Database

Problem Display
PID: 218506 (1b6/6K1/2Q1p2N/3p3p/3PkNbR/4P3/3nBP2/2q5 w - - 0 1)

Abraham, Victor

Cincinnati Commercial, 1881

1b6/6K1/2Q1p2N/3p3p/3PkNbR/4P3/3nBP2/2q5

#2

9 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Qc2#
    • 1...Qe1
      • 2.Qc2#
    • 1...Qf1
      • 2.Qc2#
    • 1...Qg1
      • 2.Qc2#
    • 1...Qh1
      • 2.Qc2#
    • 1...Qc2
      • 2.Qxc2#
    • 1...Bf3
      • 2.Bd3#
    • 1...Sf3
      • 2.Bd3#
    • 1...e5
      • 2.Qxd5#
  • Tries
    • 1.Qxe6+?
      • 1...Be5+
        • 2.Qxe5#
      • 1...Bxe6!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Sc3#
        • 2.Sf6#
      • 1...Be5+
        • 2.Sf6#
      • 1...Qxc6
        • 2.Sf6#
      • 1...exd5
        • 2.Qg6#
      • 1...Qc3
        • 2.Sxc3#
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD,P_PINP(D)::QAB(G)
    • Q(a);N_GUARD::QAB(G)
    • Q(a);N_GUARD::QAB(G),XQ(a)
    • B(d);SBLOCK::B(A)
    • S(b);SBLOCK::B(A)
    • P(g);N_GUARD::QAB1(G),XP(e)
  • Tries
    • Try
      • Q(G);CHECK,N_PINP(e),XP(g)
      • Vars
        • B(h);CHECK,N_GUARD,P_SPINB(h)::QAR1(G),XB(h)
      • Refutation
        • B(d);XQ(G)
  • Actual
    • S(E);P_PINB(d),XP(e)
    • Threat
      • DUALS(2)
    • Vars
      • B(h);CHECK::QAB(G)+S(E),DCHECK
      • Q(a);XQ(G)::S(E)
      • P(g);OGATE,P_SPINP(g),SBLOCK,XS(E)::QAB(G)
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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).