MESON Chess Problem Database

Problem Display
PID: 67568 (1NR5/1qr1p3/1pb1Q2K/1pk1n2R/8/P1PB1n2/3P1N2/4r3 w - - 0 1)

Ellerman, Arnoldo

Chess, 1948

1NR5/1qr1p3/1pb1Q2K/1pk1n2R/8/P1PB1n2/3P1N2/4r3

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Sxa6#
    • 1...Be4
      • 2.Sd7#
    • 1...Bd5
      • 2.Qxe7#
    • 1...Bd7
      • 2.Sxd7#
    • 1...b4
      • 2.axb4#
  • Tries
    • 1.Se4+?
      • 1...Bxe4
        • 2.Sd7#
      • 1...Rxe4!
    • 1.Rxc7?
      • threat
        • 2.Sd7#
      • 1...Qxc7
        • 2.Sa6#
      • 1...Qxb8
        • 2.Rxc6#
        • 2.Qxc6#
      • 1...Qc8
        • 2.Qxc6#
      • 1...Sg5!
  • Keys
    • 1.Be2!
      • threat
        • 2.Sd3#
      • 1...Rd7
        • 2.Se4#
      • 1...Be4
        • 2.Sd7#
      • 1...Bd5
        • 2.Qxe7#
      • 1...Sg5
        • 2.d4#
      • 1...b4
        • 2.axb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(h);N_GUARD::S(I),XQ(h)
    • B(g);N_GUARD,P_SPINR(i)::S(I)
    • B(g);N_SPINS(e),P_SPINR(i),SBLOCK::QAB(G),XP(j)
    • B(g);N_GUARD,P_SPINR(i)::S(I),XB(g)
    • P(c);OGATE::P(C),XP(c)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • B(g);P_SPINR(i),XS(B)::S(I)
      • Refutation
        • R(a);XS(B)
    • Try
      • R(J);P_PINB(g),XR(i)
      • Threat
        • S(I)
      • Vars
        • Q(h);N_GUARD,N_SPINB(g),XR(J)::S(I)
        • Q(h);N_GUARD::QAR1(G),XB(g)
      • Refutation
        • S(b);N_SPINS(e)
  • Actual
    • B(E);
    • Threat
      • S(B)
    • Vars
      • R(i);P_SPINB(g)::S(B)
      • B(g);N_GUARD,P_SPINR(i)::S(I)
      • B(g);N_SPINS(e),P_SPINR(i),SBLOCK::QAB(G),XP(j)
      • S(b);N_GUARD,N_SPINS(e)::P(A)
      • P(c);OGATE::P(C),XP(c)
HTML5 logo

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).