MESON Chess Problem Database

Problem Display
PID: 100872 (3Rn1b1/8/1b1p2n1/1P1k2P1/1p2NBPp/1p1KRBr1/6N1/Q7 w - - 0 1)

Constable, BC

Good Companions, 1920

3Rn1b1/8/1b1p2n1/1P1k2P1/1p2NBPp/1p1KRBr1/6N1/Q7

#2

11 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc5
      • 2.Sc3#
      • 2.Sxg3#
      • 2.Sf6#
    • 1...Be6
      • 2.Qa8#
    • 1...Sxf4+
      • 2.Sxf4#
    • 1...Se5+
      • 2.Qxe5#
    • 1...Se7
      • 2.Qe5#
    • 1...Sf8
      • 2.Qe5#
    • 1...Sh8
      • 2.Qe5#
    • 1...Sf6
      • 2.Rxd6#
    • 1...Sc7
      • 2.Rxd6#
    • 1...Sg7
      • 2.Rxd6#
  • Tries
    • 1.Sc5+?
      • 1...Rxf3
        • 2.Qd4#
      • 1...Kxc5!
    • 1.Sxd6+?
      • 1...Kc5
        • 2.Qd4#
      • 1...Rxf3!
    • 1.Qb2?
      • threat
        • 2.Qxb3#
      • 1...Sxf4+
        • 2.Sxf4#
      • 1...Se5+
        • 2.Qxe5#
      • 1...Ke6!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxg8#
      • 1...Sxf4+
        • 2.Sxf4#
      • 1...Se5+
        • 2.Qxe5#
      • 1...Ke6
        • 2.Sc5#
      • 1...Sxg7
        • 2.Rxd6#
      • 1...Be6
        • 2.Qb7#
      • 1...Bf7
        • 2.Qxf7#
      • 1...Bh7
        • 2.Qf7#
      • 1...Se7
        • 2.Qe5#
      • 1...Sf8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#
      • 1...Sf6
        • 2.Rxd6#
      • 1...Sc7
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(j);SBLOCK::QAB(A)
    • S(h);CHECK,XB(G)::S(B),XS(h)
    • S(h);CHECK,N_GUARD::QAR1(A),XS(h)
    • S(h);N_GUARD::QAR1(A)
    • S(i);N_GUARD::R1(K),XP(g)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • R(b);P_PINR(D),XB(E)::QAR1(A)
      • Refutation
        • K(e);N_SPINP(g),P-FLIGHT,XS(F)
    • Try
      • S(F);CHECK,XP(g)
      • Vars
        • K(e);P-FLIGHT::QAB1(A)
      • Refutation
        • R(b);P_PINR(D),XB(E)
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(a)
      • Vars
        • S(h);CHECK,XB(G)::S(B),XS(h)
        • S(h);CHECK,N_GUARD::QAR1(A),XS(h)
      • Refutation
        • K(e);N_SPINP(g),S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB(A),XB(j)
    • Vars
      • S(h);CHECK,XB(G)::S(B),XS(h)
      • S(h);CHECK,N_GUARD::QAR1(A),XS(h)
      • K(e);N_SPINP(g),S_FLIGHT::R(D)+S(F),DCHECK
      • S(i);N_GUARD,XQ(A)::R1(K),XP(g)
      • B(j);SBLOCK::QAB(A)
      • B(j);N_GUARD::QAB(A),XB(j)
      • B(j);N_GUARD::QAB(A)
      • S(h);N_GUARD::QAR1(A)
      • S(i);N_GUARD::R1(K),XP(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).