MESON Chess Problem Database

Problem Display
PID: 239470 (7K/B1p5/p4n2/rR1P2Q1/N3k3/3r1pp1/2P4p/1n3NqB w - - 0 1)

Ellerman, Arnoldo

Magyar Sakkelet, 1951

7K/B1p5/p4n2/rR1P2Q1/N3k3/3r1pp1/2P4p/1n3NqB

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Sxg3#
    • 1...Qd4
      • 2.Sxg3#
    • 1...Qxh1
      • 2.Sxg3#
    • 1...Re3
      • 2.Rb4#
    • 1...Rd4
      • 2.Sc5#
    • 1...g2
      • 2.Sg3#
  • Tries
    • 1.Rb4+?
      • 1...Qd4
        • 2.Sxg3#
      • 1...Rd4!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Qe5#
      • 1...Kxd4
        • 2.Rb4#
      • 1...Qxd4
        • 2.Sxg3#
      • 1...Rxd4
        • 2.Sc5#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sd7
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD::S(A),XP(f)
    • Q(b);N_GUARD,N_SPINP(e),XB(B)::S(A),XP(f)
    • R(d);N_GUARD,S_CUTQ(b)::R(E)
    • R(d);SBLOCK,S_CUTQ(b)::S(D)
    • P(f);N_SPINP(e),S_CUTQ(b)::S(A)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • Q(b);P_SPINQ(b)::S(A),XP(f)
      • Refutation
        • R(d);P_SPINR(d)
  • Actual
    • B(H);
    • Threat
      • QAR1(G)
    • Vars
      • K(g);N_SPINP(e),OGATEB,P-FLIGHT,XB(H)::R(E)
      • Q(b);N_GUARD,SBLOCK,XB(H)::S(A),XP(f)
      • R(d);SBLOCK,XB(H)::S(D)
      • S(j);N_GUARD::QAR2(G),XS(j)
      • S(j);N_GUARD::QAR2(G)
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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).