MESON Chess Problem Database

Problem Display
PID: 65066 (4R2n/2B1n1Pb/K2Nr2p/4kpbP/1p3p2/3QpB2/2P5/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions (November), 1921

4R2n/2B1n1Pb/K2Nr2p/4kpbP/1p3p2/3QpB2/2P5/8

#2

9 + 11

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.gxh8Q#
      • 2.gxh8B#
    • 1...Rxd6+
      • 2.Qxd6#
    • 1...Rf6
      • 2.Qd5#
    • 1...Sc6
      • 2.Se4#
    • 1...b3
      • 2.Qc3#
  • Tries
    • 1.Qe4+?
      • 1...Kf6
        • 2.gxh8Q#
        • 2.gxh8B#
      • 1...fxe4!
    • 1.Qxe3+?
      • 1...Kf6
        • 2.gxh8Q#
        • 2.gxh8B#
      • 1...fxe3!
    • 1.Qd5+?
      • 1...Kf6
        • 2.gxh8Q#
        • 2.gxh8B#
      • 1...Sxd5!
    • 1.gxh8Q+?
      • 1...Rf6
        • 2.Rxe7#
        • 2.Qd5#
      • 1...Bf6!
    • 1.gxh8B+?
      • 1...Rf6
        • 2.Rxe7#
        • 2.Qd5#
      • 1...Bf6!
  • Keys
    • 1.c3!
      • threat
        • 2.Qd4#
      • 1...Rxd6+
        • 2.Qxd6#
      • 1...Kf6
        • 2.gxh8Q#
        • 2.gxh8B#
      • 1...bxc3
        • 2.Qxc3#
      • 1...Rg6
        • 2.Qxf5#
      • 1...Rf6
        • 2.Qd5#
      • 1...Sc6
        • 2.Se4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(d);S_FLIGHT::PXS(k)=Q
    • R(g);CHECK,OGATE,P_SPINR(g),P_SPINS(i),XS(F)::QAB1(B),XR(g)
    • R(g);P_SPINS(i),SBLOCK::QAR1(B)
    • S(i);N_PINS(F),P_SPINR(g)::B(G)+S(F)
    • P(b);N_GUARD::QAB(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);S_FLIGHT::PXS(k)=Q
      • Refutation
        • P(e);XQ(B)
    • Try
      • Q(B);CHECK,XP(a)
      • Vars
        • K(d);S_FLIGHT::PXS(k)=Q
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);S_FLIGHT::PXS(k)=Q
      • Refutation
        • S(i);P_SPINR(g),XQ(B)
    • Try
      • P(H);CHECK,XS(k)
      • Refutation
        • B(f);P_SPINB(f)
    • Try
      • P(H);CHECK,XS(k)
      • Refutation
        • B(f);P_SPINB(f)
  • Actual
    • P(A);
    • Threat
      • QAB1(B)
    • Vars
      • R(g);CHECK,OGATE,P_SPINR(g),P_SPINS(i),XS(F)::QAB1(B),XR(g)
      • K(d);S_FLIGHT::PXS(k)=Q
      • P(b);OGATE,XP(A)::QAB(B),XP(b)
      • R(g);P_SPINS(i),S_CUTB(j)::QAR1(B),XP(e)
      • R(g);P_SPINS(i),SBLOCK::QAR1(B)
      • S(i);N_PINS(F),P_SPINR(g)::B(G)+S(F)
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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).