MESON Chess Problem Database

Problem Display
PID: 121550 (8/B4nK1/8/4kB2/6P1/6p1/b5Q1/8 w - - 0 1)

Petersen, H

Deutsches Wochenschach, 1911

8/B4nK1/8/4kB2/6P1/6p1/b5Q1/8

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Qxg3#
  • Tries
    • 1.Bb8+?
      • 1...Sd6
        • 2.Qe4#
      • 1...Kd4!
    • 1.Qe2+?
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qe6#
      • 1...Kd6!
    • 1.Qf2?
      • threat
        • 2.Qd4#
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#
      • 1...Bd5
        • 2.Qxg3#
      • 1...gxf2!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qd4#
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#
      • 1...Bd5
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::QAB(A),XP(b)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • S(d);P_SPINS(d)::QAR1(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
        • K(c);OGATE,P-FLIGHT::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • K(c);S_FLIGHT::QAB1(A)
        • B(a);SBLOCK::QAB(A),XP(b)
      • Refutation
        • P(b);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(c);S_FLIGHT::QAB1(A)
      • K(c);P-FLIGHT::QAR1(A)
      • B(a);SBLOCK::QAB(A),XP(b)
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