MESON Chess Problem Database

Problem Display
PID: 51819 (8/1K6/NQ6/1N6/k6b/1rp5/pqB5/2B5 w - - 0 1)

Sydenham, Colin Peter

1st Prize, The Problemist TT, 1976

8/1K6/NQ6/1N6/k6b/1rp5/pqB5/2B5

#2

6 + 6

3310 2345 Chess Problems 1997
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Sxc3#
    • 1...Qb1
      • 2.Sxc3#
  • Tries
    • 1.Sxc3+?
      • 1...Ka3
        • 2.Qxb3#
      • 1...Qxc3!
    • 1.Sd4?
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qxb3#
      • 1...Qxc2
        • 2.Sc5#
      • 1...Qa3
        • 2.Qb5#
      • 1...Be7!
    • 1.Sa7?
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qxb3#
      • 1...Qxc2
        • 2.Sc5#
      • 1...Qa3
        • 2.Qb5#
      • 1...Be7!
    • 1.Sbc7?
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qxb3#
      • 1...Qxc2
        • 2.Sc5#
      • 1...Qa3
        • 2.Qb5#
      • 1...Be7!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qxb3#
      • 1...Qxc2
        • 2.Sc5#
      • 1...Qa3
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_GUARD::S(C),XP(d)
  • Tries
    • Try
      • S(C);CHECK,P_SPINQ(E),XP(d)
      • Vars
        • K(e);N_SPINR(c),P-FLIGHT,P_SPINQ(b)::QAR1(E),XR(c)
      • Refutation
        • Q(b);XS(C)
    • Try
      • S(C);P_SPINQ(E)
      • Threat
        • QAR1(E)
      • Vars
        • K(e);N_SPINR(c),P-FLIGHT,P_SPINQ(b)::QAR1(E),XR(c)
        • Q(b);N_SPINR(c),XB(B)::S(D)
        • Q(b);::QAB1(E)
      • Refutation
        • B(f);
    • Try
      • S(C);P_SPINQ(E)
      • Threat
        • QAR1(E)
      • Vars
        • K(e);N_SPINR(c),P-FLIGHT,P_SPINQ(b)::QAR1(E),XR(c)
        • Q(b);N_SPINR(c),XB(B)::S(D)
        • Q(b);::QAB1(E)
      • Refutation
        • B(f);
    • Try
      • S(C);P_SPINQ(E)
      • Threat
        • QAR1(E)
      • Vars
        • K(e);N_SPINR(c),P-FLIGHT,P_SPINQ(b)::QAR1(E),XR(c)
        • Q(b);N_SPINR(c),XB(B)::S(D)
        • Q(b);::QAB1(E)
      • Refutation
        • B(f);
  • Actual
    • S(C);P_SPINQ(E)
    • Threat
      • QAR1(E)
    • Vars
      • K(e);N_SPINR(c),P-FLIGHT,P_SPINQ(b)::QAR1(E),XR(c)
      • Q(b);N_SPINR(c),XB(B)::S(D)
      • Q(b);::QAB1(E)
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).