MESON Chess Problem Database

Problem Display
PID: 65154 (3QR3/5K2/B1p1N2b/7p/3P4/Rqn1kpB1/3p1N2/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions (October), 1921

3QR3/5K2/B1p1N2b/7p/3P4/Rqn1kpB1/3p1N2/8

#2

9 + 8

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Sf4#
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sg7#
      • 2.Sf8#
      • 2.Rxc3#
    • 1...Qa2
      • 2.Rxc3#
    • 1...Qa4
      • 2.Sf4#
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sg7#
      • 2.Sf8#
      • 2.Rxc3#
    • 1...Qd5
      • 2.Rxc3#
    • 1...Qxe6+
      • 2.Rxe6#
    • 1...Qb2
      • 2.Sf4#
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sg7#
      • 2.Sf8#
    • 1...Qb4
      • 2.Sc5#
    • 1...Qb5
      • 2.Sc5#
    • 1...Qb6
      • 2.Sf4#
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sg7#
      • 2.Sf8#
      • 2.Rxc3#
    • 1...Qb7+
      • 2.Sc7#
    • 1...Qb8
      • 2.Sc7#
      • 2.Rxc3#
    • 1...Bg5
      • 2.Qxg5#
    • 1...Bg7
      • 2.Qg5#
    • 1...Bf8
      • 2.Qg5#
    • 1...Se4
      • 2.Sd1#
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxh6#
      • 1...Qxe6+
        • 2.Rxe6#
      • 1...Qb7+
        • 2.Sc7#
      • 1...Qc4
        • 2.Qe5#
      • 1...Qb5
        • 2.Sc5#
      • 1...Sb5
        • 2.Qe5#
      • 1...Qd5
        • 2.Rxc3#
      • 1...Qb8
        • 2.Rxc3#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Bg5
        • 2.Qxg5#
      • 1...Bg7
        • 2.Qg5#
        • 2.Qf4#
      • 1...Bf8
        • 2.Qg5#
        • 2.Qf4#
      • 1...Se2
        • 2.Qe5#
      • 1...Se4
        • 2.Sd1#
      • 1...Sd5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 4
  • Sets
    • Q(b);OGATE,P_SPINS(c)::R(B),XS(c)
    • Q(b);CHECK,OGATE,P_SPINQ(b),P_SPINS(c),XS(F)::R(I),XQ(b)
    • Q(b);N_PINS(F),P_SPINS(c)::R(I)+S(F)
    • Q(b);CHECK,N_PINS(F),P_SPINS(c)::R(I)+S(F)
    • B(h);N_GUARD::QAB(H),XB(h)
    • B(h);N_GUARD::QAB(H)
    • S(c);N_GUARD,P_SPINQ(b),SBLOCK::S(A)
  • Actual
    • Q(H);
    • Threat
      • QAB(H),XB(h)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),P_SPINS(c),XS(F)::R(I),XQ(b)
      • Q(b);CHECK,N_PINS(F),P_SPINS(c)::R(I)+S(F)
      • Q(b);P_SPINS(c)::QAR2(H)
      • Q(b);N_PINS(F),P_SPINS(c)::R(I)+S(F)
      • S(c);N_GUARD,P_SPINQ(b)::QAR2(H)
      • Q(b);OGATE,P_SPINS(c)::R(B),XS(c)
      • Q(b);N_PINS(F),OGATE,P_SPINS(c)::R(B),XS(c)
      • B(h);N_GUARD::QAB1(H),XB(h)
      • B(h);N_GUARD::QAB(H),XB(h)
      • S(c);N_GUARD,P_SPINQ(b),SBLOCK::S(A)
      • S(c);N_GUARD,N_PINS(F),P_SPINQ(b)::QAR2(H)
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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).