MESON Chess Problem Database

Problem Display
PID: 120068 (4q3/4B3/6p1/8/8/1p6/k7/3QK2R w K - 0 1)

Ursic, Andrej Anton

Bohemia, 1908

4q3/4B3/6p1/8/8/1p6/k7/3QK2R

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qe2+?
      • 1...Ka1
        • 2.Kf2#
        • 2.0-0#
      • 1...Kb1
        • 2.Kf2#
        • 2.0-0#
      • 1...b2!
    • 1.Qxb3+?
      • 1...Ka1
        • 2.Kd2#
        • 2.Ke2#
        • 2.Kf2#
        • 2.0-0#
      • 1...Kxb3!
    • 1.Qd2+?
      • 1...Ka1
        • 2.Ke2#
        • 2.Kf2#
        • 2.0-0#
      • 1...Kb1
        • 2.Ke2#
        • 2.Kf2#
        • 2.0-0#
      • 1...b2!
  • Keys
    • 1.0-0!
      • threat
        • 2.Qa1#
        • 2.Qb1#
      • 1...Kb2
        • 2.Qd2#
      • 1...Qxe7
        • 2.Qa1#
      • 1...b2
        • 2.Qd5#
      • 1...Qh8
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK,N_SPINB(D)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);CHECK,XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • K(B);0-0,N_SPINB(D)
    • Threat
      • DUALS(2)
    • Vars
      • K(a);P-FLIGHT::QAR2(A)
      • Q(d);XB(D)::QAR1(A)
      • P(b);OGATEB,SBLOCK::QAB(A)
      • Q(d);::QAB1(A)
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