MESON Chess Problem Database

Problem Display
PID: 139598 (6K1/Q2p2Rp/2Pn1k2/p1P2bN1/4p1pB/4N3/5br1/5R2 w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1923

6K1/Q2p2Rp/2Pn1k2/p1P2bN1/4p1pB/4N3/5br1/5R2

#2

9 + 10

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Bg3
      • 2.Sxg4#
    • 1...Be6+
      • 2.Sf7#
    • 1...dxc6
      • 2.Qe7#
  • Tries
    • 1.Sf3+?
      • 1...Ke6
        • 2.Re7#
        • 2.Qxd7#
      • 1...Bxh4!
    • 1.Sxe4+?
      • 1...Ke6
        • 2.Re7#
      • 1...Ke5!
    • 1.Sf7+?
      • 1...Ke6
        • 2.Qxd7#
      • 1...Bxh4!
    • 1.Sxh7+?
      • 1...Ke6
        • 2.Re7#
      • 1...Ke5!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qb2#
      • 1...Be6+
        • 2.Sf7#
      • 1...Ke5
        • 2.Qxd6#
      • 1...Bxe3
        • 2.Qxd6#
      • 1...Bxh4
        • 2.Qxd6#
      • 1...Be1
        • 2.Qxd6#
      • 1...Bg1
        • 2.Qxd6#
      • 1...Bg3
        • 2.Sxg4#
      • 1...Sc4
        • 2.Sd5#
      • 1...Sb5
        • 2.Sd5#
      • 1...Sb7
        • 2.Sd5#
      • 1...Sf7
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • B(a);P_SPINB(f),S_CUTR(b)::S(B),XP(d)
    • B(f);CHECK,P_SPINB(a),SBLOCK::B(C)+S(E)
    • P(i);OGATE,XP(F)::QAB1(G)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • B(a);XB(C)
    • Try
      • S(E);CHECK,XP(c)
      • Vars
        • K(h);P-FLIGHT::R1(H)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • K(h);P-FLIGHT::QAB1(G),XP(i)
      • Refutation
        • B(a);P_SPINB(f),XB(C)
    • Try
      • S(E);CHECK,XP(j)
      • Vars
        • K(h);P-FLIGHT::R1(H)
      • Refutation
        • K(h);S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAB(G)
    • Vars
      • B(f);CHECK,P_SPINB(a),SBLOCK::B(C)+S(E)
      • K(h);P_SPINS(g),S_FLIGHT::QAB1(G),XS(g)
      • B(a);P_SPINB(f),XS(B)::QAR2(G),XS(g)
      • B(a);P_SPINB(f),XB(C)::QAR2(G),XS(g)
      • B(a);P_SPINB(f)::QAR2(G),XS(g)
      • B(a);P_SPINB(f),S_CUTR(b)::S(B),XP(d)
      • S(g);::S(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).