MESON Chess Problem Database

Problem Display
PID: 139596 (5R2/2Kp2Bb/4N3/1pPk1p1n/2pNrP2/8/6r1/1Q1R3B w - - 0 1)

Ellerman, Arnoldo

Good Companions (March), 1923

5R2/2Kp2Bb/4N3/1pPk1p1n/2pNrP2/8/6r1/1Q1R3B

#2

10 + 9

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Rg6
      • 2.Rxf5#
    • 1...Rxe6
      • 2.Sb3#
    • 1...c3
      • 2.Qb3#
  • Tries
    • 1.Sxf5+?
      • 1...Kxe6
        • 2.Rd6#
        • 2.Qxe4#
      • 1...Rd2
        • 2.Qxe4#
      • 1...Rd4!
    • 1.Rxf5+?
      • 1...Re5
        • 2.Bxg2#
        • 2.Rxe5#
      • 1...Bxf5!
  • Keys
    • 1.Kb6!
      • threat
        • 2.Sc7#
      • 1...Rxe6+
        • 2.Sc6#
      • 1...dxe6
        • 2.Rd8#
      • 1...c3
        • 2.Qb3#
      • 1...Rg6
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(a);P_SPINR(c),S_CUTB(i)::R(J),XP(f)
    • R(c);N_GUARD,P_SPINR(a),SBLOCK,XS(G)::R(B)+S(D)
    • P(b);OGATEB::QAB(A)
  • Tries
    • Try
      • S(D);CHECK,XP(f)
      • Vars
        • R(a);P_SPINR(a)::QAB1(A),XR(c)
      • Refutation
        • R(c);P_SPINR(a)
    • Try
      • R(J);CHECK,XP(f)
      • Refutation
        • B(i);XR(J)
  • Actual
    • K(H);S_FLIGHT
    • Threat
      • S(G)
    • Vars
      • R(c);CHECK,N_GUARD,P_SPINR(a),SBLOCK,XS(G)::R(B)+S(D)
      • P(h);OGATEB,XS(G)::R(J)
      • P(b);OGATEB::QAB(A)
      • R(a);P_PINS(G),P_SPINR(c),S_CUTB(i)::R(J),XP(f)
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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).