MESON Chess Problem Database

Problem Display
PID: 238160 (B7/1r1pKN2/3p1PNB/5k1p/8/3Rbp1P/6r1/Q5R1 w - - 0 1)

Hermanson, Halvar

Deutsche Schachzeitung, 1977

B7/1r1pKN2/3p1PNB/5k1p/8/3Rbp1P/6r1/Q5R1

#2

10 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Sxd6#
    • 1...Rgb2
      • 2.Sxd6#
    • 1...Rc2
      • 2.Sxd6#
    • 1...Rd2
      • 2.Sxd6#
    • 1...Re2
      • 2.Sxd6#
    • 1...Rf2
      • 2.Sxd6#
    • 1...Rh2
      • 2.Sxd6#
    • 1...Rxg6
      • 2.Sxd6#
    • 1...Rb1
      • 2.Sh4#
    • 1...Rbb2
      • 2.Sh4#
    • 1...Rb3
      • 2.Sh4#
    • 1...Rb5
      • 2.Sh4#
    • 1...Rb6
      • 2.Sh4#
    • 1...Ra7
      • 2.Sh4#
    • 1...Rc7
      • 2.Sh4#
    • 1...Rb8
      • 2.Sh4#
  • Tries
    • 1.Qe5+?
      • 1...Kxg6
        • 2.Qe4#
      • 1...dxe5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Rd5#
      • 1...Ke4
        • 2.Sxd6#
        • 2.Rd2#
      • 1...Kxg6
        • 2.Rb3#
      • 1...Rxb1
        • 2.Sh4#
      • 1...Rc2
        • 2.Sxd6#
      • 1...Bd4
        • 2.Rxf3#
      • 1...d5
        • 2.Rxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 14
  • Sets
    • R(a);::S(I),XP(f)
    • R(a);XS(F)::S(I),XP(f)
    • R(g);::S(F)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P_SPINR(a),S_FLIGHT,XS(F)::QAB(A)
      • Refutation
        • P(f);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+R(C),DCHECK
    • Vars
      • K(d);P_SPINR(a),S_FLIGHT,XS(F)::QAB(A)+R(C)
      • R(g);XQ(A)::S(F)
      • R(a);::S(I),XP(f)
      • B(b);OGATE::QAB(A)+R(C),DCHECK,XP(c)
      • P(f);::QAB(A)+R(C),DCHECK,XP(f)
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