MESON Chess Problem Database

Problem Display
PID: 182371 (8/8/1Q1K4/8/3Nk3/3p4/3P4/8 w - - 0 1)

Bobrov, Pavel Pavlovich

La Strategie, 1906

8/8/1Q1K4/8/3Nk3/3p4/3P4/8

#2

4 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qa5?
      • threat
        • 2.Qe5#
      • 1...Kxd4
        • 2.Qb4#
        • 2.Qa4#
        • 2.Qd5#
      • 1...Kf4!
    • 1.Qb1?
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kf4!
    • 1.Qb3?
      • 1...Kxd4
        • 2.Qa4#
        • 2.Qd5#
        • 2.Qb4#
      • 1...Kf4!
    • 1.Qb5?
      • threat
        • 2.Qe5#
      • 1...Kxd4
        • 2.Qa4#
        • 2.Qb4#
        • 2.Qd5#
      • 1...Kf4!
    • 1.Qa6?
      • 1...Kxd4
        • 2.Qa4#
      • 1...Kf4!
    • 1.Qc6+?
      • 1...Kxd4
        • 2.Qa4#
        • 2.Qd5#
      • 1...Kf4!
    • 1.Qb7+?
      • 1...Kxd4
        • 2.Qd5#
        • 2.Qb4#
      • 1...Kf4!
    • 1.Qb8?
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kf4!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qh4#
      • 1...Kxd4
        • 2.Qh4#
      • 1...Kf4
        • 2.Qh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),OGATEB,P-FLIGHT,XS(B)::QAR2(C)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
    • Try
      • Q(C);
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(b);OGATEB,P-FLIGHT,XS(B)::QAR(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(b);OGATEB,P-FLIGHT,XS(B)::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • K(b);P-FLIGHT,XS(B)::QAR(C)
      • K(b);P-FLIGHT::QAR2(C)
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