MESON Chess Problem Database

Problem Display
PID: 222668 (2NQ4/6B1/2p1p3/1p1qN3/1Rnk4/5R2/5b2/1B1K4 w - - 0 1)

Nix, John Gilbert

Cincinnati Commercial, 1883

2NQ4/6B1/2p1p3/1p1qN3/1Rnk4/5R2/5b2/1B1K4

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Qxd6#
    • 1...c5
      • 2.Sc6#
  • Tries
    • 1.Qb6+?
      • 1...c5
        • 2.Sc6#
      • 1...Qc5!
    • 1.Qd6?
      • threat
        • 2.Sxc6#
      • 1...c5
        • 2.Sc6#
      • 1...Qxd6!
  • Keys
    • 1.Qg5!
      • 1...Kc5+
        • 2.Sd3#
      • 1...Qxf3+
        • 2.Sxf3#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Qe4
        • 2.Sxc6#
      • 1...Qd6
        • 2.Sxc6#
      • 1...Qd7
        • 2.Sxc6#
      • 1...Qd8
        • 2.Sxc6#
      • 1...Be3
        • 2.Qxe3#
      • 1...Qc5
        • 2.Sxc6#
        • 2.Qd2#
      • 1...Be1
        • 2.Qe3#
      • 1...Bg1
        • 2.Qxg1#
      • 1...Bg3
        • 2.Qe3#
      • 1...Bh4
        • 2.Qe3#
      • 1...c5
        • 2.Sc6#
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 11
    • REMOVED MATES = 1
  • Sets
    • Q(e);OGATEB::QAR2(H),XQ(e)
    • P(f);SBLOCK::B(F)+S(E),DCHECK
  • Tries
    • Try
      • Q(H);CHECK,N_PINQ(e)
      • Vars
        • P(f);P_SPINP(f)::B(F)+S(E),DCHECK
      • Refutation
        • Q(e);P_SPINQ(e)
    • Try
      • Q(H);
      • Threat
        • B(F)+S(E),DCHECK,XP(f)
      • Vars
        • P(f);::B(F)+S(E),DCHECK
      • Refutation
        • Q(e);N_SPINQ(e),XQ(H)
  • Actual
    • Q(H);N_PINQ(e)
    • Vars
      • K(c);CHECK,N_SPINS(b),S_FLIGHT::S(E)
      • Q(e);CHECK,XR(C)::B(F)+S(E),DCHECK,XQ(e)
      • Q(e);OGATE,P_SPINQ(e),XS(E)::QAB1(H),XQ(e)
      • Q(e);::B(F)+S(E),DCHECK,XP(f)
      • B(a);N_GUARD::QAB1(H),XB(a)
      • B(a);N_GUARD::QAB1(H)
      • B(a);OGATEB::QAB(H),XB(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).