MESON Chess Problem Database

Problem Display
PID: 205700 (8/8/4K3/8/3pk3/4p3/4Q3/3B4 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1925

8/8/4K3/8/3pk3/4p3/4Q3/3B4

#2

3 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qg4#
    • 1...d3
      • 2.Qg4#
  • Tries
    • 1.Kd6?
      • 1...Kf4
        • 2.Qg4#
      • 1...d3
        • 2.Qg4#
      • 1...Kf5!
    • 1.Bc2+?
      • 1...d3
        • 2.Qg4#
      • 1...Kf4!
    • 1.Bb3?
      • 1...d3
        • 2.Qg4#
      • 1...Kf4!
    • 1.Ba4?
      • 1...d3
        • 2.Qg4#
      • 1...Kf4!
    • 1.Qb5?
      • threat
        • 2.Qf5#
      • 1...Kf4
        • 2.Qe5#
      • 1...d3
        • 2.Qa4#
        • 2.Qc4#
        • 2.Qb4#
        • 2.Qe5#
      • 1...e2!
    • 1.Qc2+?
      • 1...d3
        • 2.Qa4#
        • 2.Qc4#
      • 1...Kf4!
    • 1.Qh2?
      • 1...Kd3
        • 2.Qc2#
      • 1...d3
        • 2.Qe5#
        • 2.Qh4#
      • 1...e2!
  • Keys
    • 1.Qg2+!
      • 1...Kd3
        • 2.Qc2#
      • 1...Kf4
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(c);N_SPINP(a),P-FLIGHT::QAR1(B)
    • P(b);SBLOCK::QAR2(B)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(c);N_SPINP(a),P-FLIGHT::QAR1(B)
        • P(b);SBLOCK::QAR2(B)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(A);CHECK
      • Vars
        • P(b);N_SPINP(a),P_SPINP(b)::QAR2(B)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • B(A);
      • Vars
        • P(b);SBLOCK::QAR2(B)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • B(A);
      • Vars
        • P(b);SBLOCK::QAR2(B)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • Q(B);N_PINP(a)
      • Threat
        • QAB1(B)
      • Vars
        • K(c);P-FLIGHT::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);N_PINP(a)
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • P(a);
  • Actual
    • Q(B);CHECK,N_PINP(a)
    • Vars
      • K(c);S_FLIGHT::QAB1(B)
      • K(c);P-FLIGHT::QAR1(B)
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