MESON Chess Problem Database

Problem Display
PID: 51238 (1Q4BB/8/8/3n4/p3p3/K2k1n1R/NR6/4r3 w - - 0 1)

Rendall, JL

Manchester Guardian, 1955

1Q4BB/8/8/3n4/p3p3/K2k1n1R/NR6/4r3

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qb5#
    • 1...Re3
      • 2.Qb5#
    • 1...Se3
      • 2.Sb4#
  • Tries
    • 1.Qb3+?
      • 1...Sc3
        • 2.Qxc3#
      • 1...axb3!
    • 1.Qb4?
      • threat
        • 2.Qd4#
      • 1...Ke3
        • 2.Qd2#
      • 1...Re3
        • 2.Sc1#
        • 2.Qb5#
      • 1...Se3
        • 2.Qc3#
      • 1...Sf6
        • 2.Qd2#
        • 2.Qc3#
      • 1...e3
        • 2.Bh7#
      • 1...Sxb4!
  • Keys
    • 1.Qh2!
      • 1...Ke3
        • 2.Qd2#
      • 1...Kc4
        • 2.Qc2#
      • 1...Ra1
        • 2.Qe2#
      • 1...Rb1
        • 2.Qe2#
      • 1...Rc1
        • 2.Qe2#
      • 1...Rd1
        • 2.Qe2#
      • 1...Rf1
        • 2.Qe2#
      • 1...Rg1
        • 2.Qe2#
      • 1...Rh1
        • 2.Qe2#
      • 1...Re2
        • 2.Qxe2#
      • 1...Re3
        • 2.Qc2#
      • 1...Sc3
        • 2.Qd2#
      • 1...Se3
        • 2.Sb4#
      • 1...Sb4
        • 2.Qd2#
      • 1...Sf4
        • 2.Qd2#
      • 1...Sb6
        • 2.Qd2#
      • 1...Sf6
        • 2.Qd2#
      • 1...Sc7
        • 2.Qd2#
      • 1...Se7
        • 2.Qd2#
      • 1...e3
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 17
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINS(c),P_SPINS(f),S_FLIGHT::QAB1(E)
    • R(a);N_SPINS(c),SBLOCK::QAB(E)
    • S(f);N_GUARD,N_SPINS(c),SBLOCK::S(A)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • S(f);N_GUARD,N_SPINS(c),P_SPINS(f)::QAR1(E),XS(f)
      • Refutation
        • P(d);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(b);P-FLIGHT::QAB1(E)
        • S(f);N_GUARD,N_SPINS(c),SBLOCK::QAR1(E)
        • P(e);N_SPINS(c),OGATEB,SBLOCK::B(F)
      • Refutation
        • S(f);XQ(E)
  • Actual
    • Q(E);
    • Vars
      • K(b);P-FLIGHT::QAB1(E)
      • K(b);N_SPINS(c),P_SPINS(f),S_FLIGHT::QAR2(E)
      • R(a);N_GUARD,P_PINS(A)::QAB1(E)
      • R(a);N_GUARD::QAB1(E)
      • R(a);N_GUARD::QAB1(E),XR(a)
      • R(a);N_SPINS(c),SBLOCK::QAB1(E)
      • S(f);::QAR1(E)
      • S(f);N_GUARD,N_SPINS(c),SBLOCK::S(A)
      • P(e);N_SPINS(c),SBLOCK::QAB1(E)
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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).