MESON Chess Problem Database

Problem Display
PID: 153541 (b5rb/4p1nq/1p2p3/1PP3p1/3Pk1B1/1R1R4/3KN3/Q7 w - - 0 1)

Ellerman, Arnoldo

Good Companions (March), 1916

b5rb/4p1nq/1p2p3/1PP3p1/3Pk1B1/1R1R4/3KN3/Q7

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Qh1#
    • 1...Qh1
      • 2.Qxh1#
    • 1...Bd5
      • 2.Re3#
    • 1...Sf5
      • 2.Bf3#
    • 1...Sh5
      • 2.Qh1#
    • 1...Se8
      • 2.Qxa8#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Sc3#
        • 2.Qg2#
        • 2.Qf3#
      • 1...Qf5
        • 2.Sc3#
      • 1...Qh1
        • 2.Sc3#
        • 2.Qxh1#
      • 1...Qh2
        • 2.Qf3#
      • 1...Qh3
        • 2.Sc3#
      • 1...Rf8
        • 2.Sc3#
      • 1...Kd5!
  • Keys
    • 1.Rb4!
      • threat
        • 2.d5#
      • 1...Kd5
        • 2.Sc3#
      • 1...bxc5
        • 2.dxc5#
      • 1...Bd5
        • 2.Re3#
      • 1...Sf5
        • 2.Bf3#
      • 1...Sh5
        • 2.Qh1#
      • 1...Se8
        • 2.Qxa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(g);N_GUARD::QAB(A)
    • Q(g);N_GUARD::QAB(A),XQ(g)
    • B(h);SBLOCK::R1(E)
    • S(f);SBLOCK::B(G)
    • S(f);S_CUTQ(g)::QAB(A)
    • S(f);S_CUTR(i)::QAB(A),XB(h)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • Q(g);::S(C)
        • Q(g);P_PINS(C)::QAB1(A)
        • R(i);::S(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • R(D);
    • Threat
      • R(D)+P(F)
    • Vars
      • K(a);S_FLIGHT::S(C)
      • P(c);OGATE,XP(I)::R(D)+P(F),XP(c)
      • B(h);SBLOCK::R1(E)
      • S(f);SBLOCK::B(G)
      • S(f);S_CUTQ(g)::QAB(A)
      • S(f);S_CUTR(i)::QAB(A),XB(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).