MESON Chess Problem Database

Problem Display
PID: 109051 (4n3/QKn5/Nppp4/k1b5/b1pN4/8/RBq5/8 w - - 0 1)

Narroway, Edward

Vancouver Province, 1953

4n3/QKn5/Nppp4/k1b5/b1pN4/8/RBq5/8

#2

6 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ba3
      • 2.Qxb6#
    • 1...Bb4
      • 2.Sxc7#
      • 2.Qxb6#
    • 1...Sb5
      • 2.Sxc6#
    • 1...b5
      • 2.Sxc6#
  • Tries
    • 1.Sb4+?
      • 1...Sa6
        • 2.Sbxc6#
      • 1...Kxb4!
    • 1.Sxc5+?
      • 1...Sa6
        • 2.Qxb6#
      • 1...Kb4!
    • 1.Sb8+?
      • 1...Sa6
        • 2.Sbxc6#
      • 1...Kb4!
    • 1.Bc3+?
      • 1...Bb4
        • 2.Sxc7#
        • 2.Bxb4#
        • 2.Qxb6#
      • 1...Qxc3!
  • Keys
    • 1.Ba3!
      • threat
        • 2.Sxc7#
      • 1...Bxa3
        • 2.Qxb6#
      • 1...Sxa6
        • 2.Qxa6#
      • 1...Bb5
        • 2.Bb4#
      • 1...Sb5
        • 2.Sxc6#
      • 1...Sd5
        • 2.Sb4#
        • 2.Sxc5#
        • 2.Sc7#
        • 2.Sb8#
      • 1...Se6
        • 2.Sb4#
        • 2.Sxc5#
        • 2.Sc7#
        • 2.Sb8#
      • 1...Sa8
        • 2.Sb4#
        • 2.Sxc5#
        • 2.Sc7#
        • 2.Sb8#
      • 1...b5
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(e);N_GUARD,N_SPINB(b)::QAB1(E),XP(f)
    • S(i);SBLOCK::S(C),XP(g)
    • P(f);SBLOCK::S(C),XP(g)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • S(i);P_SPINS(i)::S(D),XP(g)
      • Refutation
        • K(d);N_SPINB(b),S_FLIGHT,XS(D)
    • Try
      • S(D);CHECK,XB(e)
      • Vars
        • S(i);P_SPINS(i)::QAB1(E),XP(f)
      • Refutation
        • K(d);N_SPINB(b),S_FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • S(i);P_SPINS(i)::S(D),XP(g)
      • Refutation
        • K(d);N_SPINB(b),S_FLIGHT
    • Try
      • B(B);CHECK
      • Refutation
        • Q(a);XB(B)
  • Actual
    • B(B);N_PINB(b)
    • Threat
      • QAR(E)+S(D),XS(i)
    • Vars
      • B(e);N_GUARD,XB(B)::QAB1(E),XP(f)
      • S(i);OGATE,P_SPINS(i),XS(D)::QAR1(E),XS(i)
      • B(b);::R(A)+B(B),DCHECK
      • S(i);SBLOCK,S_CUTB(b)::S(C),XP(g)
      • P(f);SBLOCK,S_CUTB(b)::S(C),XP(g)
HTML5 logo

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).