MESON Chess Problem Database

Problem Display
PID: 185835 (8/2Q1Kn1B/N7/3k4/R1p1p3/2p5/rN1P4/1q2Rbb1 w - - 0 1)

Hermanson, Halvar

Chess, 1957

8/2Q1Kn1B/N7/3k4/R1p1p3/2p5/rN1P4/1q2Rbb1

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc5#
    • 1...Bh2
      • 2.Qc5#
    • 1...Bd4
      • 2.Sb4#
    • 1...Bc5+
      • 2.Qxc5#
    • 1...Se5
      • 2.Qd6#
    • 1...Sg5
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sh6
      • 2.Qd6#
    • 1...Sd8
      • 2.Qd6#
    • 1...Sh8
      • 2.Qd6#
    • 1...e3
      • 2.Qc5#
  • Tries
    • 1.Bxe4+?
      • 1...Kd4
        • 2.Qc5#
      • 1...Qxe4+!
    • 1.Bg8?
      • threat
        • 2.Qd6#
      • 1...Bc5+
        • 2.Qxc5#
      • 1...Kd4
        • 2.Qc5#
      • 1...Bh2
        • 2.Qc5#
      • 1...e3!
    • 1.Re3?
      • threat
        • 2.Qc5#
      • 1...Kd4
        • 2.Qc5#
      • 1...Bxe3!
    • 1.Ra5+?
      • 1...Kd4
        • 2.Qb6#
        • 2.Qc5#
        • 2.Qa7#
      • 1...Bc5+
        • 2.Qxc5#
      • 1...Rxa5!
    • 1.Qa5+?
      • 1...Kd4
        • 2.Qc5#
        • 2.dxc3#
      • 1...Bc5+
        • 2.Qxc5#
      • 1...Kc6!
    • 1.Qd7+?
      • 1...Sd6
        • 2.Qxd6#
      • 1...Ke5!
  • Keys
    • 1.d4!
      • threat
        • 2.Qc5#
      • 1...Kxd4
        • 2.Qc5#
      • 1...Bxd4
        • 2.Sb4#
      • 1...cxd4 ep
        • 2.Bxe4#
      • 1...exd4 ep
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • K(h);P-FLIGHT,P_SPINP(f)::QAB1(F)
    • B(c);N_GUARD::QAR1(F)
    • B(c);SBLOCK::S(E)
    • B(c);CHECK,N_GUARD::QAR1(F),XB(c)
    • S(i);N_GUARD::QAR1(F)
    • S(i);N_GUARD::QAR1(F),XS(i)
    • P(g);S_CUTB(c)::QAR1(F)
  • Tries
    • Try
      • B(H);CHECK,XP(g)
      • Vars
        • K(h);P-FLIGHT,P_SPINP(f)::QAB1(F)
      • Refutation
        • Q(a);CHECK,XB(H)
    • Try
      • B(H);P_PINS(i)
      • Threat
        • QAR1(F)
      • Vars
        • B(c);CHECK,N_GUARD::QAR1(F),XB(c)
        • K(h);N_SPINS(i),P-FLIGHT,P_SPINP(f)::QAB1(F)
        • B(c);N_GUARD::QAR1(F)
      • Refutation
        • P(g);
    • Try
      • R(A);
      • Threat
        • QAR1(F)
      • Vars
        • K(h);P-FLIGHT,P_SPINP(f)::QAB1(F)
      • Refutation
        • B(c);XR(A)
    • Try
      • R(D);CHECK
      • Vars
        • B(c);CHECK,N_GUARD,P_SPINB(c)::QAR1(F),XB(c)
      • Refutation
        • R(d);XR(D)
    • Try
      • Q(F);CHECK
      • Vars
        • B(c);CHECK,N_GUARD,P_SPINB(c)::QAR1(F),XB(c)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAR1(F),XS(i)
      • Refutation
        • K(h);P-FLIGHT,P_SPINP(g)
  • Actual
    • P(C);
    • Threat
      • QAR1(F)
    • Vars
      • K(h);P-FLIGHT,P_SPINP(f),XP(C)::QAB1(F)
      • B(c);SBLOCK,XP(C)::S(E)
      • P(f);EP,S_CUTQ(a),XP(C)::B(H),XP(g)
      • P(g);EP,S_CUTB(b),XP(C)::QAB1(F),XP(f)
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