MESON Chess Problem Database

Problem Display
PID: 249950 (7Q/B1N5/R1P3p1/P1PNP1rP/3kbR2/1np1p3/2PpB3/3K2n1 w - - 0 1)

Ellerman, Arnoldo

Stella Polaris, 1969

7Q/B1N5/R1P3p1/P1PNP1rP/3kbR2/1np1p3/2PpB3/3K2n1

#2

14 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rg2
      • 2.e6#
    • 1...Rg3
      • 2.e6#
    • 1...Rg4
      • 2.e6#
  • Tries
    • 1.Sf6?
      • threat
        • 2.Rxe4#
      • 1...Kxe5
        • 2.Sfd5#
      • 1...Rxe5
        • 2.Sb5#
      • 1...Rg4!
    • 1.Bd3?
      • threat
        • 2.Rxe4#
      • 1...Rg4
        • 2.e6#
      • 1...e2+!
    • 1.Rb6?
      • threat
        • 2.Rb4#
      • 1...Kxc5
        • 2.Ra6#
      • 1...Sxa5!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Se6#
      • 1...Kxc5
        • 2.Sbd5#
      • 1...Sxc5
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(h);N_GUARD::QAB(N)+P(H)
  • Tries
    • Try
      • S(G);
      • Threat
        • R1(D),XB(g)
      • Vars
        • K(f);N_SPINB(g),S_FLIGHT,XP(H)::QAB(N)+S(G)
        • R(h);SBLOCK,XP(H)::S(M)
      • Refutation
        • R(h);
    • Try
      • B(C);
      • Threat
        • R1(D),XB(g)
      • Vars
        • R(h);N_GUARD::QAB(N)+P(H)
      • Refutation
        • P(e);CHECK
    • Try
      • R(J);
      • Threat
        • R(J)
      • Vars
        • K(f);N_SPINB(g),OGATEB,S_FLIGHT,XP(F)::B(L)+R(J)
      • Refutation
        • S(c);XP(E)
  • Actual
    • S(G);
    • Threat
      • S(M)
    • Vars
      • K(f);N_SPINB(g),S_FLIGHT,XP(F)::B(L)+S(G)
      • S(c);SBLOCK,XP(F)::S(M)
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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).