MESON Chess Problem Database

Problem Display
PID: 241981 (1N6/8/8/4p3/Qpk1N3/4K3/8/8 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1933

1N6/8/8/4p3/Qpk1N3/4K3/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qb3#
      • 2.Qc6#
  • Tries
    • 1.Qc2+?
      • 1...Kd5
        • 2.Qb3#
        • 2.Qc6#
      • 1...Kb5!
    • 1.Qa2+?
      • 1...Kb5
        • 2.Qa6#
      • 1...b3!
    • 1.Qa3?
      • threat
        • 2.Qd3#
      • 1...Kb5
        • 2.Qa6#
      • 1...Kd5
        • 2.Qb3#
      • 1...b3
        • 2.Qc5#
      • 1...bxa3!
    • 1.Qxb4+?
      • 1...Kd5
        • 2.Qb3#
      • 1...Kxb4!
    • 1.Qa5?
      • 1...b3
        • 2.Sd2#
        • 2.Sd6#
        • 2.Qc5#
      • 1...Kb3!
    • 1.Qa6+?
      • 1...Kd5
        • 2.Qc6#
      • 1...Kb3!
    • 1.Qa7?
      • 1...Kb5
        • 2.Sd6#
        • 2.Qa6#
      • 1...Kd5
        • 2.Qf7#
      • 1...b3
        • 2.Qc5#
      • 1...Kb3!
  • Keys
    • 1.Sd2+!
      • 1...Kc3
        • 2.Qb3#
      • 1...Kc5
        • 2.Qc6#
      • 1...Kd5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • Q(B);N_PINP(a)
      • Threat
        • QAB1(B)
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • K(b);S_FLIGHT::QAB(B)
        • P(a);OGATE,SBLOCK::QAR1(B)
      • Refutation
        • P(a);XQ(B)
    • Try
      • Q(B);CHECK,XP(a)
      • Vars
        • K(b);S_FLIGHT::QAB(B)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
    • Try
      • Q(B);N_PINP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);N_PINP(a)
      • Vars
        • K(b);S_FLIGHT::QAB(B)
        • P(a);SBLOCK::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(C);CHECK
    • Vars
      • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
      • K(b);N_SPINP(a),S_FLIGHT::QAB1(B)
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