MESON Chess Problem Database

Problem Display
PID: 186342 (B7/nn5K/5R2/4kpPp/2P3q1/b3B3/2N2N2/1Q6 w - - 0 1)

Roosendaal, Jan C

Die Schwalbe, 1955

B7/nn5K/5R2/4kpPp/2P3q1/b3B3/2N2N2/1Q6

#2

9 + 7

15601 Albrecht-Leiss-Degener Collection 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sa5
      • 2.Sd3#
    • 1...Sc5
      • 2.Qb8#
    • 1...Sd6
      • 2.Sd3#
    • 1...Sd8
      • 2.Sd3#
    • 1...f4
      • 2.Bd4#
  • Tries
    • 1.Qa1+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Bb2!
    • 1.Qb2+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Bxb2!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Re6#
      • 1...Qxd4
        • 2.Qxf5#
      • 1...Sc5
        • 2.Qb8#
      • 1...Sd8
        • 2.Sd3#
      • 1...f4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(g);::S(C)
    • S(g);OGATE::QAB(A)
    • P(d);S_CUTQ(b)::B(D)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB1(A),XQ(b)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB1(A),XQ(b)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • S(B);
    • Threat
      • R1(G)
    • Vars
      • Q(b);N_GUARD,XS(B)::QAR1(A),XP(d)
      • S(g);OGATE::QAB(A)
      • S(g);::S(C)
      • P(d);N_GUARD,S_CUTQ(b)::QAR1(A)
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