MESON Chess Problem Database

Problem Display
PID: 135395 (1b6/8/1Q2pp2/1bpPkr2/1Bp1Nn1R/5n2/K2N1PB1/3R4 w - - 0 1)

Karlstrom, Alfred Olaf

4th Comm., Olympic Ty., 1948

1b6/8/1Q2pp2/1bpPkr2/1Bp1Nn1R/5n2/K2N1PB1/3R4

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qxc5#
  • Tries
    • 1.Bc3+?
      • 1...Kxd5
        • 2.Qxc5#
      • 1...Sd4!
    • 1.Qxe6+?
      • 1...Kd4
        • 2.Sb3#
        • 2.Sxf3#
      • 1...Sxe6!
    • 1.Qxb8+?
      • 1...Kxd5
        • 2.Qd6#
      • 1...Kd4!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Sxf3#
      • 1...Kd4
        • 2.Sxf3#
      • 1...Kxd5
        • 2.Qxc5#
      • 1...Sxd2
        • 2.Bc3#
      • 1...Sxh4
        • 2.Bc3#
      • 1...Sxg2
        • 2.Qxe6#
      • 1...Sxd5
        • 2.Re4#
      • 1...Bc6
        • 2.Sxc4#
      • 1...Se1
        • 2.Bc3#
      • 1...Sg1
        • 2.Bc3#
      • 1...Sh2
        • 2.Bc3#
      • 1...Sd4
        • 2.Qxb8#
      • 1...Sg5
        • 2.Bc3#
      • 1...Se2
        • 2.Qxe6#
      • 1...Sd3
        • 2.Qxe6#
      • 1...Sh3
        • 2.Qxe6#
      • 1...Sh5
        • 2.Qxe6#
      • 1...Sg6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 16
    • REMOVED MATES = 0
  • Sets
    • K(f);OGATEB,P-FLIGHT,XP(I)::QAR1(J),XP(e)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(I)::QAR1(J),XP(e)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(J);CHECK,XP(h)
      • Refutation
        • S(c);XQ(J)
    • Try
      • Q(J);CHECK,XB(j)
      • Vars
        • K(f);P-FLIGHT,XP(I)::QAR1(J)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • S(G);
    • Threat
      • S(C),XS(a)
    • Vars
      • K(f);P_SPINP(e),P_SPINS(c),S_FLIGHT::R(A)+S(C),DCHECK,XS(a)
      • K(f);OGATEB,P-FLIGHT,P_SPINS(a),XP(I)::QAR1(J),XP(e)
      • S(a);N_GUARD,XS(C)::B(F)
      • S(a);N_GUARD,XR(H)::B(F)
      • S(c);N_GUARD,XB(E)::QAR1(J),XP(h)
      • S(c);OGATE,SBLOCK,XP(I)::R1(H)
      • B(d);N_GUARD::S(C),XP(b)
      • S(a);N_GUARD::B(F)
      • S(a);SBLOCK::QAB(J),XB(j)
      • S(c);N_GUARD::QAR1(J),XP(h)
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