MESON Chess Problem Database

Problem Display
PID: 237723 (b5Qb/2R1r3/2q5/pR1N1N2/P1k2B1p/2ppp3/8/7K w - - 0 1)

Ellerman, Arnoldo

Shakhmaty v SSSR, 1947

b5Qb/2R1r3/2q5/pR1N1N2/P1k2B1p/2ppp3/8/7K

#2

8 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rcxc5#
    • 1...Re4
      • 2.Sdxe3#
      • 2.Sb6#
    • 1...Bd4
      • 2.Sd6#
  • Tries
    • 1.Rb4+?
      • 1...Kc5
        • 2.Bd6#
      • 1...axb4!
    • 1.Qg2?
      • threat
        • 2.Sb6#
        • 2.Qa2#
      • 1...Qxc7
        • 2.Qa2#
      • 1...Rxc7
        • 2.Sdxe3#
        • 2.Qa2#
      • 1...d2
        • 2.Qe2#
      • 1...Bd4
        • 2.Sd6#
        • 2.Qa2#
      • 1...e2
        • 2.Sb6#
      • 1...c2!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Be5#
      • 1...Qc5
        • 2.Rcxc5#
      • 1...d2
        • 2.Qe2#
      • 1...Re4
        • 2.Sb6#
      • 1...Re5
        • 2.Bxe5#
      • 1...Rg7
        • 2.Bg5#
      • 1...Bd4
        • 2.Sd6#
      • 1...Be5
        • 2.Bxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE::R1(G),XQ(g)
    • B(j);SBLOCK::S(F)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(d);P-FLIGHT::B(C)
      • Refutation
        • P(f);XR(D)
    • Try
      • Q(H);N_SPINS(E)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);N_SPINQ(g),XR(G)::QAB(H)
        • P(b);OGATEB::QAB(H)
        • P(c);::S(E)
      • Refutation
        • P(a);
  • Actual
    • Q(H);
    • Threat
      • QAR(H)+B(C)
    • Vars
      • Q(g);OGATE::R1(G),XQ(g)
      • P(b);OGATEB::QAB(H)
      • R(h);N_PINS(E)::S(E)
      • R(h);::QAR(H)+B(C),XR(h)
      • R(h);N_GUARD,S_CUTB(j)::QAR(H)+B(C)
      • B(j);SBLOCK::S(F)
      • B(j);::QAR(H)+B(C),XB(j)
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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).