MESON Chess Problem Database

Problem Display
PID: 179120 (4NN2/1b1p4/1q1B2p1/3k1nR1/p2P3p/1r1Q3K/B7/2R5 w - - 0 1)

Ellerman, Arnoldo

Arbeidermagasinet, 1935

4NN2/1b1p4/1q1B2p1/3k1nR1/p2P3p/1r1Q3K/B7/2R5

#2

9 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Rc5#
    • 1...Qc5
      • 2.Rxc5#
    • 1...Qd8
      • 2.Rc5#
    • 1...Qa6
      • 2.Rc5#
  • Tries
    • 1.Bxb3+?
      • 1...Qxb3
        • 2.Rc5#
      • 1...axb3!
    • 1.Bc5?
      • threat
        • 2.Qf3#
      • 1...Kc6
        • 2.d5#
      • 1...Qxc5
        • 2.Rxc5#
      • 1...Qe6!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Qf3#
      • 1...Qxd4
        • 2.Rc5#
      • 1...Sxd4
        • 2.Rg5#
      • 1...Sxd6
        • 2.Sf6#
      • 1...Se3
        • 2.Qe4#
      • 1...Sg3
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(f);N_GUARD,P_SPINQ(f),XP(E)::R1(A)
    • Q(f);N_GUARD::R1(A),XQ(f)
    • Q(f);N_GUARD::R1(A)
  • Tries
    • Try
      • B(B);CHECK,N_SPINQ(C),XR(a)
      • Vars
        • Q(f);P_PINQ(C),XB(B)::R1(A)
      • Refutation
        • P(b);XB(B)
    • Try
      • B(G);
      • Threat
        • QAB(C)
      • Vars
        • K(d);N_SPINR(a),N_SPINS(e),OGATE,S_FLIGHT::P(E)
        • Q(f);OGATE,XB(G)::R1(A),XQ(f)
      • Refutation
        • Q(f);
  • Actual
    • R(F);N_PINS(e)
    • Threat
      • QAB(C)
    • Vars
      • Q(f);N_GUARD,P_SPINQ(f),XP(E)::R1(A)
      • S(e);OGATEB,P_SPINS(e),XP(E)::R(F)
      • S(e);SBLOCK,XB(G)::S(H)
      • S(e);N_PINQ(C)::QAB1(C)
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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).