MESON Chess Problem Database

Problem Display
PID: 205705 (3Q3N/3pp3/4k3/6P1/4K3/8/8/8 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1925

3Q3N/3pp3/4k3/6P1/4K3/8/8/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qb6#
    • 1...d5+
      • 2.Qxd5#
    • 1...d6
      • 2.Qc8#
  • Tries
    • 1.Kd4?
      • 1...Kd6
        • 2.Qb6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qc8#
      • 1...Kf5!
    • 1.Sg6?
      • threat
        • 2.Qxe7#
      • 1...d5+
        • 2.Qxd5#
      • 1...Kd6
        • 2.Qb6#
      • 1...Kf7!
    • 1.Qc7?
      • threat
        • 2.Qe5#
      • 1...d6
        • 2.Qc8#
      • 1...d5+!
    • 1.Qa8?
      • threat
        • 2.Qd5#
      • 1...d5+
        • 2.Qxd5#
      • 1...d6
        • 2.Qc8#
      • 1...Kd6!
    • 1.Qb8?
      • threat
        • 2.Qe5#
      • 1...d6
        • 2.Qc8#
      • 1...d5+!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qd5#
        • 2.Qe5#
      • 1...d5+
        • 2.Qxd5#
      • 1...Kd6
        • 2.Qb6#
      • 1...d6
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINP(b)::QAR2(C)
    • P(b);CHECK,OGATE::QAB1(C),XP(b)
    • P(b);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAR2(C)
        • P(b);OGATE::QAB1(C),XP(b)
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(D);
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • P(b);CHECK,OGATE::QAB1(C),XP(b)
        • K(a);P-FLIGHT,P_SPINP(b)::QAR2(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(b);CHECK::QAB1(C),XP(b)
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • P(b);CHECK
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • P(b);CHECK::QAB1(C),XP(b)
      • K(a);P-FLIGHT::QAR2(C)
      • P(b);SBLOCK::QAB1(C)
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