MESON Chess Problem Database

Problem Display
PID: 173586 (8/8/8/2K5/kB6/p7/Qp6/1n6 w - - 0 1)

Boros, Sandor

Magyar Sakkvilag, 1926

8/8/8/2K5/kB6/p7/Qp6/1n6

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qxa3#
    • 1...Sc3
      • 2.Qxa3#
  • Tries
    • 1.Kb6?
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Kxb4!
    • 1.Kc6?
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Kxb4!
    • 1.Qxb2?
      • threat
        • 2.Qc2#
      • 1...Sd2
        • 2.Qxa3#
      • 1...axb2!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Be1#
        • 2.Bd2#
        • 2.Bc3#
        • 2.Qc2#
      • 1...Sd2
        • 2.Bxd2#
      • 1...Sc3
        • 2.Bxc3#
      • 1...a2
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(A),XP(c)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Vars
        • S(a);N_GUARD::QAR1(A),XP(c)
      • Refutation
        • K(d);N_SPINP(c),P-FLIGHT,XB(B)
    • Try
      • K(C);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAR1(A),XP(c)
      • Refutation
        • K(d);N_SPINP(c),P-FLIGHT,XB(B)
    • Try
      • Q(A);N_PINP(c),XP(b)
      • Threat
        • QAB(A)
      • Vars
        • S(a);N_GUARD::QAR1(A),XP(c)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • Q(A);N_PINP(c)
    • Threat
      • DUALS(4)
    • Vars
      • S(a);::QAR(A)+B(B),XS(a)
      • P(c);::QAB(A)
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