MESON Chess Problem Database

Problem Display
PID: 273129 (1B2K3/n3p3/1R2P1p1/PPk2nR1/pp6/8/2NN2Bp/2Q3q1 w - - 0 1)

Russell, HA

The Problemist, 1931

1B2K3/n3p3/1R2P1p1/PPk2nR1/pp6/8/2NN2Bp/2Q3q1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb5
      • 2.Rc6#
    • 1...h1B
      • 2.Qxg1#
    • 1...b3
      • 2.Qa3#
  • Tries
    • 1.Qb2?
      • threat
        • 2.Qe5#
        • 2.Qxb4#
      • 1...Qxg2
        • 2.Qd4#
      • 1...Qe3
        • 2.Qxb4#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qa1
        • 2.Qxb4#
      • 1...Qb1
        • 2.Qd4#
        • 2.Qe5#
      • 1...Qe1
        • 2.Qd4#
        • 2.Qxb4#
      • 1...b3
        • 2.Qa3#
        • 2.Qc3#
        • 2.Qe5#
      • 1...Sc6!
  • Keys
    • 1.Be5!
      • threat
        • 2.Se1#
      • 1...Sd6+
        • 2.Bxd6#
      • 1...Sg7+
        • 2.Bxg7#
      • 1...Qxc1
        • 2.Bd4#
      • 1...Qxg2
        • 2.Se3#
      • 1...Sxb5
        • 2.Rc6#
      • 1...Qe3
        • 2.Sxe3#
      • 1...Qd4
        • 2.Sxd4#
        • 2.Bxd4#
      • 1...Qd1
        • 2.Bd4#
      • 1...Qe1
        • 2.Sxe1#
        • 2.Bd4#
      • 1...Qf1
        • 2.Bd4#
      • 1...Se3
        • 2.Bd4#
        • 2.Bd6#
      • 1...Sd4
        • 2.Bxd4#
        • 2.Bd6#
      • 1...b3
        • 2.Qa3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • S(h);N_GUARD,SBLOCK,XP(F)::R1(H)
    • P(b);N_GUARD::QAB(A),XQ(a)
    • P(d);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_GUARD,XB(D)::QAB1(A)
        • Q(a);::QAB1(A),XP(d)
        • Q(a);N_GUARD::QAB1(A),XQ(a)
      • Refutation
        • S(h);
  • Actual
    • B(J);N_PINS(f)
    • Threat
      • QAR(A)+S(B)
    • Vars
      • S(f);CHECK::R(G)+B(J),DCHECK,XS(f)
      • S(f);CHECK,OGATEB::R(G)+B(J),XS(f)
      • Q(a);N_GUARD,XQ(A)::B(J)
      • Q(a);N_GUARD,XB(D)::QAR(A)+S(B)
      • S(h);N_GUARD,SBLOCK,XP(F)::R1(H)
      • Q(a);N_GUARD::QAR(A)+S(B),XQ(a)
      • Q(a);N_GUARD::B(J)
      • P(d);OGATEB::QAB(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).