MESON Chess Problem Database

Problem Display
PID: 10421 (8/8/4p3/1p2N1R1/n3k3/1N4p1/3K4/2Q4n w - - 0 1)

Sja'rani, H

Probleemblad, 1964

8/8/4p3/1p2N1R1/n3k3/1N4p1/3K4/2Q4n

#2

5 + 6

3242 BCPS Rapid Solving (Cheltenham) 2001
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Kd3#
    • 1...Kd5
      • 2.Qc6#
    • 1...b4
      • 2.Qc4#
  • Tries
    • 1.Qb1+?
      • 1...Kd5
        • 2.Qd3#
      • 1...Kf4!
    • 1.Qe1+?
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5!
    • 1.Qf1?
      • threat
        • 2.Qf3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Sf2!
    • 1.Qg1?
      • threat
        • 2.Qd4#
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qd4#
      • 1...Sf2!
    • 1.Qxh1+?
      • 1...Kf4
        • 2.Qh4#
      • 1...g2!
    • 1.Qc2+?
      • 1...Kd5
        • 2.Qd3#
        • 2.Qc6#
      • 1...Kf4!
    • 1.Qc3?
      • threat
        • 2.Qd4#
        • 2.Qf3#
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qd4#
        • 2.Qd3#
        • 2.Qc6#
      • 1...Sxc3!
    • 1.Qc5?
      • threat
        • 2.Qd4#
      • 1...Kf4
        • 2.Qe3#
      • 1...Sxc5!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qf3#
      • 1...Kf4
        • 2.Qg4#
      • 1...Kd5
        • 2.Ke3#

Anticipated by 79019(1961)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(d);P-FLIGHT::QAB(A)+K(B)
    • K(d);S_FLIGHT::QAB1(A)
    • P(e);N_GUARD::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR2(A)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT::QAB1(A)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(d);S_FLIGHT::QAR2(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(d);P-FLIGHT::QAB1(A)
        • K(d);S_FLIGHT::QAR1(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK,XS(a)
      • Vars
        • K(d);P-FLIGHT::QAR2(A)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT::QAB1(A)
      • Refutation
        • S(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(d);P-FLIGHT::QAB1(A)
      • Refutation
        • S(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(d);P-FLIGHT::QAR1(A)
      • K(d);S_FLIGHT::QAR(A)+K(B)
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