MESON Chess Problem Database

Problem Display
PID: 91907 (r7/1q1P4/3B4/2Rp1P2/2Nk2N1/2RP1p1r/7p/Qbn1b2K w - - 0 1)

Hermanson, Halvar

Sveriges Schackforbund, 1968

r7/1q1P4/3B4/2Rp1P2/2Nk2N1/2RP1p1r/7p/Qbn1b2K

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sd2?
      • threat
        • 2.Be5#
      • 1...Sxd3
        • 2.R3c4#
      • 1...Qc7
        • 2.Ra3#
      • 1...Re8
        • 2.Rb3#
      • 1...Bg3
        • 2.Sxf3#
      • 1...Qb8!
    • 1.Sa5?
      • threat
        • 2.Be5#
      • 1...Bxd3
        • 2.R3c4#
      • 1...Bxc3
        • 2.Qxc3#
      • 1...Sxd3
        • 2.R3c4#
      • 1...Qb8
        • 2.Sc6#
      • 1...Qc7
        • 2.Qa4#
      • 1...Bg3
        • 2.Rb3#
      • 1...Re8!
    • 1.Sce5?
      • threat
        • 2.R3c4#
      • 1...Bxc3
        • 2.Qxc3#
      • 1...Qb2
        • 2.Sc6#
      • 1...Rxa1!
    • 1.Ra3+?
      • 1...Bc3
        • 2.Qxc3#
      • 1...Qb2!
    • 1.Rb3+?
      • 1...Bc3
        • 2.Qxc3#
      • 1...Rxa1!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Be5#
      • 1...Bxd3
        • 2.R3c4#
      • 1...Bxc3
        • 2.Qxc3#
      • 1...Sxd3
        • 2.R3c4#
      • 1...Re8
        • 2.Qa4#
      • 1...Qc7
        • 2.Rxd5#
      • 1...Qb8
        • 2.Rxd5#
      • 1...Bg3
        • 2.Ra3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Threat
        • B(I)
      • Vars
        • S(b);SBLOCK,XP(D)::QAB(A)+R(C),DCHECK
        • Q(i);N_GUARD::QAB(A)+R(C)
        • R(j);N_GUARD::QAB(A)+R(C)
        • B(c);S_CUTR(f)::S(E),XP(e)
      • Refutation
        • Q(i);
    • Try
      • S(E);
      • Threat
        • B(I)
      • Vars
        • B(a);SBLOCK,XP(D)::QAB(A)+R(C),DCHECK
        • B(c);OGATE,P_SPINB(c),XR(C)::QAB1(A),XB(c)
        • S(b);SBLOCK,XP(D)::QAB(A)+R(C),DCHECK
        • Q(i);N_GUARD::S(E)
        • Q(i);N_GUARD::QAR(A)
        • B(c);N_GUARD::QAB(A)+R(C)
      • Refutation
        • R(j);
    • Try
      • S(E);
      • Threat
        • QAB(A)+R(C),DCHECK
      • Vars
        • B(c);OGATE,P_SPINB(c),XR(C)::QAB1(A),XB(c)
        • Q(i);N_GUARD::S(E)
      • Refutation
        • R(j);XQ(A)
    • Try
      • R(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAB1(A),XB(c)
      • Refutation
        • Q(i);P_SPINQ(i)
    • Try
      • R(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAB1(A),XB(c)
      • Refutation
        • R(j);XQ(A)
  • Actual
    • S(E);
    • Threat
      • B(I)
    • Vars
      • B(a);SBLOCK,XP(D)::QAB(A)+R(C),DCHECK
      • B(c);OGATE,P_SPINB(c),XR(C)::QAB1(A),XB(c)
      • S(b);SBLOCK,XP(D)::QAB(A)+R(C),DCHECK
      • R(j);N_GUARD::QAR(A)
      • Q(i);N_GUARD::R1(G),XP(h)
      • B(c);N_GUARD::QAB(A)+R(C)
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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).