MESON Chess Problem Database

Problem Display
PID: 230834 (Q7/8/8/8/4Kp2/3p1p2/4k2P/7R w - - 0 1)

Riczu, Lajos

Stella Polaris, 1968

Q7/8/8/8/4Kp2/3p1p2/4k2P/7R

#2

4 + 4

SOLUTION

  • SOUND
  • Tries
    • 1.Qa3?
      • 1...Kd2
        • 2.Qb2#
        • 2.Qxd3#
      • 1...d2
        • 2.Qxf3#
      • 1...f2
        • 2.Qxd3#
      • 1...Kf2!
    • 1.Qa6?
      • 1...Kd2
        • 2.Qxd3#
      • 1...f2
        • 2.Qxd3#
      • 1...Kf2!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qe1#
      • 1...Kd2
        • 2.Qb2#
      • 1...Kf2
        • 2.Qf1#
      • 1...d2
        • 2.Qf1#
      • 1...f2
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(D);
      • Vars
        • P(b);OGATE,SBLOCK::QAB1(D),XP(c)
        • P(c);SBLOCK::QAB1(D),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(D),XP(b)
        • P(c);SBLOCK::QAB1(D),XP(b)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAR1(D)
    • Vars
      • K(a);P-FLIGHT::QAR2(D)
      • K(a);P-FLIGHT::QAR1(D)
      • P(b);SBLOCK::QAB1(D)
      • P(c);SBLOCK::QAB1(D)
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