MESON Chess Problem Database

Problem Display
PID: 238144 (n3B3/BKp1NQ2/8/3p3R/2k1qr2/P3P3/1PP5/8 w - - 0 1)

Hermanson, Halvar

3rd Prize, Schweizerische Schachzeitung, 1979

n3B3/BKp1NQ2/8/3p3R/2k1qr2/P3P3/1PP5/8

#2

10 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2
      • 2.Qxd5#
    • 1...Qg6
      • 2.Qxd5#
    • 1...Qh7
      • 2.Qxd5#
    • 1...Qxe3
      • 2.Qxd5#
    • 1...Qxe7
      • 2.Qxd5#
  • Tries
    • 1.Rxd5?
      • threat
        • 2.Bb5#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Qxc2
        • 2.Rd4#
      • 1...c6
        • 2.Rc5#
      • 1...c5!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.b3#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Qxc2
        • 2.Sxf4#
      • 1...Qxe3
        • 2.Sxe3#
      • 1...Qxe8
        • 2.Sb6#
      • 1...Sb6
        • 2.Qxc7#
      • 1...c6
        • 2.Sb6#
      • 1...Qd3
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_GUARD,XP(B)::QAB1(I),XP(d)
    • Q(b);N_GUARD::QAB1(I),XP(d)
    • Q(b);N_GUARD,XP(D)::QAB1(I),XP(d)
    • Q(b);N_GUARD,XS(H)::QAB1(I),XP(d)
  • Tries
    • Try
      • R(E);P_SPINR(E),XP(d)
      • Threat
        • B(J)
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XR(E)::QAB1(I),XQ(b)
        • Q(b);N_PINR(E),XP(B)::QAB(I)+R(E),DCHECK
        • P(e);N_PINR(E)::QAB(I)+R(E),DCHECK
      • Refutation
        • P(e);
  • Actual
    • S(H);P_SPINS(H),XP(d)
    • Threat
      • P(A)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(H)::QAB1(I),XQ(b)
      • Q(b);N_PINS(H),XP(B)::QAB(I)+S(H),XR(c)
      • Q(b);N_PINS(H),XP(D)::QAB(I)+S(H),DCHECK,XQ(b)
      • Q(b);N_PINS(H),XB(J)::QAB(I)+S(H),DCHECK
      • S(f);N_GUARD::QAR(I),XP(e)
      • P(e);N_PINS(H)::QAB(I)+S(H),DCHECK
      • Q(b);N_PINS(H)::QAB(I)+S(H),DCHECK
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