MESON Chess Problem Database

Problem Display
PID: 183410 (4b3/2QRp3/K2P1p2/5P2/2Bk3p/3P2q1/3R3B/3N4 w - - 0 1)

Karlstrom, Alfred Olaf

British Chess Magazine, 1938

4b3/2QRp3/K2P1p2/5P2/2Bk3p/3P2q1/3R3B/3N4

#2

10 + 6

56 The Problemist 1943

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qf2
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qxd6+
      • 2.Qb6#
    • 1...Qg1
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qg2
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qe3
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qf3
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qh3
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qg4
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qg5
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qg6
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qg7
      • 2.Qb6#
      • 2.Qa7#
    • 1...Qg8
      • 2.Qb6#
      • 2.Qa7#
    • 1...e5
      • 2.Qb6#
      • 2.Qa7#
  • Tries
    • 1.Ba2?
      • threat
        • 2.Qc3#
      • 1...Qxd6+
        • 2.Qb6#
      • 1...Qxd3+
        • 2.Qc4#
      • 1...Ke5!
    • 1.Bb3?
      • threat
        • 2.Qc3#
      • 1...Qxd6+
        • 2.Qb6#
      • 1...Qxd3+
        • 2.Qc4#
      • 1...Ke5!
    • 1.dxe7+?
      • 1...Qd6+
        • 2.Rxd6#
        • 2.Qb6#
        • 2.Qxd6#
      • 1...Bxd7!
  • Keys
    • 1.Be6!
      • threat
        • 2.Qc3#
      • 1...Qxd6+
        • 2.Qb6#
      • 1...Qxd3+
        • 2.Qc4#
      • 1...Ke5
        • 2.dxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);CHECK,P_SPINQ(a),XP(H)::QAB(I)
  • Tries
    • Try
      • B(E);
      • Threat
        • QAB1(I)
      • Vars
        • Q(a);CHECK,P_SPINQ(a),XP(H)::QAB(I)
        • Q(a);CHECK,P_SPINQ(a),XP(D)::QAR1(I)
      • Refutation
        • K(b);P_SPINQ(a),S_FLIGHT
    • Try
      • B(E);
      • Threat
        • QAB1(I)
      • Vars
        • Q(a);CHECK,P_SPINQ(a),XP(H)::QAB(I)
        • Q(a);CHECK,P_SPINQ(a),XP(D)::QAR1(I)
      • Refutation
        • K(b);P_SPINQ(a),S_FLIGHT
    • Try
      • P(H);CHECK,XP(e)
      • Refutation
        • B(f);XR(J)
  • Actual
    • B(E);
    • Threat
      • QAB1(I)
    • Vars
      • Q(a);CHECK,P_SPINQ(a),XP(H)::QAB(I)
      • Q(a);CHECK,P_SPINQ(a),XP(D)::QAR1(I)
      • K(b);P_SPINQ(a),S_FLIGHT::QAB(I)+P(H),XP(e)
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