MESON Chess Problem Database

Problem Display
PID: 157145 (b1r5/1R6/k7/2b5/K3Q3/8/5B2/8 w - - 0 1)

Speckmann, Werner

Das Ratsel, 1929

b1r5/1R6/k7/2b5/K3Q3/8/5B2/8

#2

4 + 4

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Ba3
      • 2.Ra7#
    • 1...Bb4
      • 2.Ra7#
    • 1...Bd6
      • 2.Ra7#
    • 1...Ba7
      • 2.Rxa7#
    • 1...Be7
      • 2.Ra7#
    • 1...Bf8
      • 2.Ra7#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qb5#
      • 1...Bb4
        • 2.Ra7#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bxb7!
    • 1.Qc6+?
      • 1...Bb6
        • 2.Qxb6#
      • 1...Rxc6!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qb5#
      • 1...Bxb4
        • 2.Ra7#
      • 1...Bxb7
        • 2.Qa5#
      • 1...Bb6
        • 2.Qxb6#

There are these versions: 157146

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::R1(D)
    • B(a);N_GUARD::R1(D),XB(a)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • B(a);N_GUARD::R1(D)
        • B(a);N_GUARD::QAR1(C),XB(a)
      • Refutation
        • B(c);XR(D)
    • Try
      • Q(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(C),XB(a)
      • Refutation
        • R(d);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • B(a);N_GUARD,XQ(C)::R1(D)
      • B(c);SBLOCK,XR(D)::QAR1(C)
      • B(a);N_GUARD::QAR1(C),XB(a)
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