MESON Chess Problem Database

Problem Display
PID: 138955 (1K5Q/pRp1pk2/r5pP/r2P2p1/2B1Nb1q/8/8/5R2 w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1918

1K5Q/pRp1pk2/r5pP/r2P2p1/2B1Nb1q/8/8/5R2

#2

8 + 10

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sxg5#
    • 1...Qh1
      • 2.Sxg5#
    • 1...Qh2
      • 2.Sxg5#
    • 1...Qh3
      • 2.Sxg5#
    • 1...Re6
      • 2.dxe6#
    • 1...c5+
      • 2.d6#
    • 1...c6+
      • 2.Sd6#
    • 1...e5
      • 2.Rxc7#
    • 1...e6
      • 2.Rxc7#
  • Tries
    • 1.d6+?
      • 1...e6
        • 2.Rxc7#
      • 1...Rd5!
  • Keys
    • 1.h7!
      • threat
        • 2.Qg8#
      • 1...c5+
        • 2.d6#
      • 1...c6+
        • 2.Sd6#
      • 1...Qxh7
        • 2.Sxg5#
      • 1...e5
        • 2.Rxc7#
      • 1...e6
        • 2.Rxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD::S(C),XP(d)
    • R(e);OGATE::P(D),XR(e)
    • P(h);CHECK,P_SPINP(i),S_CUTR(c)::B(B)+P(D)
    • P(h);CHECK,N_GUARD,P_SPINP(i),S_CUTR(e)::S(C)
    • P(i);OGATEB,P_SPINP(h)::R(F),XP(h)
  • Tries
    • Try
      • P(D);CHECK
      • Vars
        • P(i);P_SPINP(i),S_CUTR(c)::R(F),XP(h)
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • P(E);
    • Threat
      • QAB1(H)
    • Vars
      • P(h);CHECK,P_SPINP(i),S_CUTR(c)::B(B)+P(D)
      • P(h);CHECK,N_GUARD,P_SPINP(i),S_CUTR(e)::S(C)
      • Q(b);N_GUARD,XP(E)::S(C),XP(d)
      • P(i);OGATEB,P_SPINP(h)::R(F),XP(h)
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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).