MESON Chess Problem Database

Problem Display
PID: 71107 (B5Q1/B2p4/1P1p4/1K1P1p2/3k1P2/1p1P4/1p1n4/bN1R1N2 w - - 0 1)

Back, Par-Erik

Sp. Prize, Schackvarlden, 1943

B5Q1/B2p4/1P1p4/1K1P1p2/3k1P2/1p1P4/1p1n4/bN1R1N2

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb1
      • 2.Qg7#
      • 2.Qh8#
    • 1...Sxf1
      • 2.b7#
    • 1...Sf3
      • 2.b7#
  • Tries
    • 1.Qe6?
      • threat
        • 2.Qe3#
      • 1...Kxd3
        • 2.Rxd2#
      • 1...Sxb1
        • 2.Qf6#
      • 1...Sxf1
        • 2.b7#
      • 1...Sc4
        • 2.dxc4#
      • 1...Se4
        • 2.dxe4#
      • 1...dxe6!
    • 1.Qc8?
      • threat
        • 2.Qc3#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Sxb1
        • 2.Qc4#
        • 2.Qh8#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se4
        • 2.Qc4#
      • 1...Sxf1!
    • 1.Qe8?
      • threat
        • 2.Qe3#
      • 1...Kxd3
        • 2.Rxd2#
      • 1...Sxb1
        • 2.Qh8#
      • 1...Sc4
        • 2.dxc4#
      • 1...Se4
        • 2.dxe4#
      • 1...Sxf1!
  • Keys
    • 1.Qg2!
      • 1...Kxd3
        • 2.Rxd2#
      • 1...Sxb1
        • 2.Qg7#
      • 1...Sxf1
        • 2.b7#
      • 1...Sc4
        • 2.dxc4#
      • 1...Sf3
        • 2.Qf2#
      • 1...Se4
        • 2.dxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);XS(C)::B(I)+P(H)
    • S(c);::B(I)+P(H)
  • Tries
    • Try
      • Q(K);
      • Threat
        • QAB1(K)
      • Vars
        • K(e);OGATEB,P-FLIGHT,P_SPINS(c),XP(D)::R1(B),XS(c)
        • S(c);XS(A)::QAB(K)
        • S(c);XS(C)::B(I)+P(H)
        • S(c);OGATE::R(B)+P(D),XS(c)
      • Refutation
        • P(h);XQ(K)
    • Try
      • Q(K);
      • Threat
        • QAB1(K)
      • Vars
        • K(e);P-FLIGHT,P_SPINS(c),XP(D)::QAB1(K)
        • S(c);N_GUARD::QAR1(K),XS(c)
        • S(c);N_GUARD::QAR1(K)
      • Refutation
        • S(c);XS(C)
    • Try
      • Q(K);
      • Threat
        • QAB1(K)
      • Vars
        • K(e);OGATEB,P-FLIGHT,P_SPINS(c),XP(D)::R1(B),XS(c)
        • S(c);XS(A)::QAB(K)
        • S(c);OGATE::R(B)+P(D),XS(c)
      • Refutation
        • S(c);XS(C)
  • Actual
    • Q(K);
    • Vars
      • K(e);OGATEB,P-FLIGHT,P_SPINS(c),XP(D)::R1(B),XS(c)
      • S(c);XS(A)::QAB(K)
      • S(c);XS(C)::B(I)+P(H)
      • S(c);OGATE::R(B)+P(D),XS(c)
      • S(c);::QAB(K)
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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).