MESON Chess Problem Database

Problem Display
PID: 78912 (qn4Q1/p4P2/p1k5/KN6/1P1R4/7b/8/8 w - - 0 1)

Lange, Hans Franz

2nd Prize, Vestiche Neueste Nachrichten, 1937/II

qn4Q1/p4P2/p1k5/KN6/1P1R4/7b/8/8

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Rd6#
    • 1...Bf1
      • 2.Qc8#
    • 1...Bg2
      • 2.Qxg2#
      • 2.Qc8#
    • 1...Bd7
      • 2.Qg2#
    • 1...Bc8
      • 2.Qg2#
      • 2.Qxc8#
    • 1...Sd7
      • 2.Qxa8#
  • Tries
    • 1.Rc4+?
      • 1...Kb7
        • 2.Sd6#
        • 2.Rc7#
      • 1...Kd7
        • 2.Qe8#
      • 1...Kd5!
    • 1.Qg3?
      • threat
        • 2.Qc7#
        • 2.Qf3#
      • 1...Kb7
        • 2.Qc7#
      • 1...Qb7
        • 2.Rd6#
        • 2.Qd6#
        • 2.Qc3#
        • 2.Qf3#
      • 1...Bg2
        • 2.Qc7#
        • 2.Qxg2#
      • 1...Bg4
        • 2.Qc7#
      • 1...Bf5
        • 2.Qc7#
      • 1...Be6
        • 2.Qc7#
      • 1...axb5!
    • 1.Qxb8?
      • threat
        • 2.Rd6#
        • 2.Qc7#
        • 2.Qxa8#
      • 1...axb5
        • 2.Rd6#
      • 1...Qb7
        • 2.Rd6#
        • 2.Qd6#
      • 1...Bc8
        • 2.Rd6#
        • 2.Qc7#
      • 1...Qxb8!
    • 1.Qd8?
      • threat
        • 2.Qc7#
        • 2.Qd5#
      • 1...Kb7
        • 2.Qc7#
      • 1...Qb7
        • 2.Rc4#
        • 2.Rd6#
        • 2.Qd5#
        • 2.Qd6#
      • 1...Bg2
        • 2.Qc7#
        • 2.Qc8#
      • 1...Be6
        • 2.Qc7#
      • 1...Bd7
        • 2.Qc7#
      • 1...Sd7
        • 2.Qc7#
        • 2.Qxa8#
      • 1...axb5!
    • 1.Qe8+?
      • 1...Bd7
        • 2.Qe4#
      • 1...Sd7
        • 2.Qe4#
        • 2.Qxa8#
      • 1...Kb7!
  • Keys
    • 1.Rd7!
      • threat
        • 2.Qc8#
      • 1...Kxd7
        • 2.Qe8#
      • 1...Bxd7
        • 2.Qg2#
      • 1...Sxd7
        • 2.Qxa8#
      • 1...Qb7
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(e);SBLOCK::R1(B)
    • B(a);N_GUARD::QAR2(F)
    • B(a);N_GUARD::QAB(F)
    • S(f);OGATE::QAB(F),XQ(e)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(F)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);S_FLIGHT::QAR1(F)
        • B(a);::QAR1(F)
      • Refutation
        • P(b);XS(D)
    • Try
      • Q(F);XS(f)
      • Threat
        • DUALS(3)
      • Vars
        • P(b);XS(D)::R1(B)
      • Refutation
        • Q(e);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);S_FLIGHT::QAR1(F)
        • B(a);::QAR1(F)
      • Refutation
        • P(b);XS(D)
    • Try
      • Q(F);CHECK
      • Vars
        • B(a);P_SPINB(a)::QAB(F)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(B);
    • Threat
      • QAR2(F)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XR(B)::QAB1(F)
      • B(a);N_GUARD,SBLOCK,XR(B)::QAB(F)
      • S(f);OGATE,SBLOCK,XR(B)::QAB(F),XQ(e)
      • Q(e);SBLOCK::R1(B)
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Developed and maintained by Brian Stephenson.
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