MESON Chess Problem Database

Problem Display
PID: 65058 (2b3B1/5r1R/pB2n1n1/1p6/1Nkp4/P1p2NQ1/K2P3q/2R5 w - - 0 1)

Ellerman, Arnoldo

1st Prize, Good Companions (November), 1921

2b3B1/5r1R/pB2n1n1/1p6/1Nkp4/P1p2NQ1/K2P3q/2R5

#2

10 + 10

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.d3#
    • 1...Qxg3
      • 2.d3#
    • 1...Qh1
      • 2.d3#
    • 1...Qxd2+
      • 2.Sxd2#
    • 1...Qh3
      • 2.d3#
    • 1...Qh4
      • 2.d3#
    • 1...Qh5
      • 2.d3#
    • 1...Qh6
      • 2.d3#
    • 1...Qxh7
      • 2.d3#
    • 1...Rxf3
      • 2.Rc7#
    • 1...Rf4
      • 2.Rc7#
    • 1...Rf6
      • 2.Rc7#
    • 1...Rc7
      • 2.Rxc7#
    • 1...Rf8
      • 2.Rc7#
    • 1...Sf4
      • 2.Se5#
    • 1...Sh4
      • 2.Se5#
    • 1...Se5
      • 2.Sxe5#
    • 1...Se7
      • 2.Se5#
    • 1...Sf8
      • 2.Se5#
    • 1...Sh8
      • 2.Se5#
    • 1...c2
      • 2.Rxc2#
    • 1...d3
      • 2.Rxc3#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Rxc3#
      • 1...Qxd2+
        • 2.Sxd2#
      • 1...Qxf4
        • 2.d3#
      • 1...Rxf4
        • 2.Rc7#
      • 1...Sgxf4
        • 2.Se5#
      • 1...c2
        • 2.Rxc2#
      • 1...Sexf4!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Rxc3#
      • 1...Qxd2+
        • 2.Sxd2#
      • 1...Rxf3
        • 2.Qxd4#
      • 1...Sef4
        • 2.Qxc8#
      • 1...Qf4
        • 2.d3#
      • 1...Rf4
        • 2.Rc7#
      • 1...Sgf4
        • 2.Se5#
      • 1...c2
        • 2.Rxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 17
  • Sets
    • Q(a);N_PINP(C)::P(C)
    • Q(a);N_PINP(C),XQ(F)::P(C)
    • Q(a);CHECK,XP(C)::S(E),XQ(a)
    • Q(a);N_PINP(C),XR(I)::P(C)
    • R(i);OGATE,P_SPINS(g),XS(E)::R(I)
    • R(i);OGATE,P_SPINS(g)::R(I)
    • R(i);OGATE,P_SPINS(g)::R(I),XR(i)
    • S(h);N_GUARD::S(E)
    • S(h);N_GUARD::S(E),XS(h)
    • P(b);N_PINP(C),OGATEB::R(A),XP(b)
    • P(d);N_GUARD::R1(A),XP(b)
  • Tries
    • Try
      • Q(F);
      • Threat
        • R1(A),XP(b)
      • Vars
        • Q(a);CHECK,XP(C)::S(E),XQ(a)
        • Q(a);N_PINP(C),XQ(F)::P(C)
        • R(i);OGATE,P_SPINS(g),XQ(F)::R(I)
        • S(h);N_GUARD,XQ(F)::S(E)
        • P(b);N_PINP(C),OGATEB::R(A),XP(b)
      • Refutation
        • S(g);P_SPINR(i),XQ(F)
  • Actual
    • Q(F);
    • Threat
      • R1(A),XP(b)
    • Vars
      • Q(a);CHECK,XP(C)::S(E),XQ(a)
      • R(i);P_SPINS(g),XS(E)::QAR1(F),XP(d)
      • S(g);OGATE,P_SPINR(i)::QAR(F),XB(j)
      • Q(a);N_PINP(C)::P(C)
      • R(i);OGATE,P_SPINS(g)::R(I)
      • S(h);N_GUARD,S_CUTQ(a)::S(E)
      • P(b);N_PINP(C),OGATEB::R(A),XP(b)
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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).