MESON Chess Problem Database

Problem Display
PID: 272867 (BB2K3/PR1Q4/1P2p3/1q2P3/R1N1k1P1/6P1/4P3/2N3b1 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1932

BB2K3/PR1Q4/1P2p3/1q2P3/R1N1k1P1/6P1/4P3/2N3b1

#2

14 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4
      • 2.Qd3#
    • 1...Qa6
      • 2.Qd3#
    • 1...Qxd7+
      • 2.Rxd7#
    • 1...Qb1
      • 2.Rc7#
    • 1...Qb2
      • 2.Rc7#
      • 2.Qd3#
    • 1...Qb3
      • 2.Rc7#
    • 1...Qb4
      • 2.Rc7#
      • 2.Qd3#
    • 1...Qa5
      • 2.Qd3#
    • 1...Qc5
      • 2.Qd3#
    • 1...Qxe5
      • 2.Qd3#
    • 1...Qxb6
      • 2.Rxb6#
      • 2.Qd3#
    • 1...Be3
      • 2.Sd2#
  • Tries
    • 1.Rc7+?
      • 1...Qc6
        • 2.Bxc6#
      • 1...Qd5!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Sbd2#
      • 1...Qxd7+
        • 2.Rxd7#
      • 1...Qxc4
        • 2.Qd3#
      • 1...Qxb3
        • 2.Rc7#
      • 1...Qb4
        • 2.Rc7#
        • 2.Qc6#
        • 2.Qd3#
      • 1...Qa5
        • 2.Qd3#
      • 1...Qd5
        • 2.Qh7#
      • 1...Be3
        • 2.Scd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_PINQ(K),P_SPINQ(c),XS(E)::QAB1(K)
    • Q(c);N_PINQ(K)::QAB1(K)
    • Q(c);CHECK,OGATE,XQ(K)::B(L)+R(J),XQ(c)
    • Q(c);N_GUARD,N_PINQ(K)::B(L)+R(J)
    • Q(c);N_PINQ(K),XP(G)::QAB1(K)
    • B(a);SBLOCK::R(D)+S(E),DCHECK
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::B(L),XQ(c)
      • Refutation
        • Q(c);N_PINQ(K),P_SPINQ(c)
  • Actual
    • S(A);
    • Threat
      • S(A)
    • Vars
      • Q(c);CHECK,OGATE,XQ(K)::B(L)+R(J),XQ(c)
      • Q(c);N_PINQ(K),P_SPINQ(c),XS(E)::QAB1(K)
      • Q(c);N_GUARD,N_PINQ(K),XS(A)::B(L)+R(J)
      • Q(c);N_PINQ(K)::QAB1(K)
      • Q(c);N_PINQ(K),SBLOCK::QAB(K)
      • B(a);SBLOCK::R(D)+S(E),DCHECK
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).