MESON Chess Problem Database

Problem Display
PID: 83590 (5N2/RQ1p1pk1/7N/5B1K/8/B7/6P1/8 w - - 0 1)

Ellerman, Arnoldo

3rd Prize, Good Companions (January), 1923

5N2/RQ1p1pk1/7N/5B1K/8/B7/6P1/8

#2

8 + 3

3391 Het Half Pin Thema 1924
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qb2#
  • Tries
    • 1.Ra8?
      • 1...Kf6
        • 2.Qb2#
      • 1...Kh8
        • 2.Se6#
      • 1...f6
        • 2.Se6#
      • 1...d6
        • 2.Bb2#
      • 1...d5!
    • 1.Qc8?
      • 1...Kf6
        • 2.Qc3#
      • 1...Kh8
        • 2.Se6#
      • 1...f6
        • 2.Se6#
      • 1...d6
        • 2.Bb2#
      • 1...d5!
    • 1.Qxd7?
      • threat
        • 2.Qd4#
      • 1...Kf6
        • 2.Bb2#
        • 2.Qd4#
      • 1...Kh8!
  • Keys
    • 1.Qb8!
      • 1...Kf6
        • 2.Qb2#
      • 1...Kh8
        • 2.Se6#
      • 1...f6
        • 2.Se6#
      • 1...d5
        • 2.Qe5#
      • 1...d6
        • 2.Bb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT::QAB(G)
  • Tries
    • Try
      • R(F);
      • Vars
        • K(c);S_FLIGHT::QAB(G)
        • K(c);S_FLIGHT::R(F)+S(H)
        • P(b);N_GUARD,P_SPINP(a),SBLOCK::S(H)
        • P(a);P_SPINP(b)::B(B)
      • Refutation
        • P(a);P_SPINP(b)
    • Try
      • Q(G);
      • Vars
        • K(c);S_FLIGHT::QAB(G)
        • K(c);S_FLIGHT::QAR(G)+S(H)
        • P(b);N_GUARD,P_SPINP(a),SBLOCK::S(H)
        • P(a);P_SPINP(b)::B(B)
      • Refutation
        • P(a);P_SPINP(b)
    • Try
      • Q(G);P_PINP(b),XP(a)
      • Threat
        • QAB(G)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
  • Actual
    • Q(G);
    • Vars
      • K(c);S_FLIGHT::QAB(G)
      • K(c);S_FLIGHT::QAR(G)+S(H)
      • P(b);N_GUARD,P_SPINP(a),SBLOCK::S(H)
      • P(a);P_SPINP(b)::QAB(G)
      • P(a);P_SPINP(b)::B(B)
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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).