MESON Chess Problem Database

Problem Display
PID: 172331 (8/1Q6/8/8/8/1KN5/3k1P1p/4n3 w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

8/1Q6/8/8/8/1KN5/3k1P1p/4n3

#2

4 + 3

6490 yacpdb 2018
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Qd5#
      • 2.Qd7#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qd1#
        • 2.Qe3#
      • 1...Kc1
        • 2.Qd1#
        • 2.Qe3#
        • 2.Qf4#
      • 1...Sc2
        • 2.Qd1#
      • 1...Sg2
        • 2.Qd1#
      • 1...Sxf3!
    • 1.Qd5+?
      • 1...Kc1
        • 2.Qd1#
        • 2.Qg5#
      • 1...Sd3!
    • 1.Qd7+?
      • 1...Kc1
        • 2.Qd1#
      • 1...Sd3!
  • Keys
    • 1.Qh1!
      • 1...Kc1
        • 2.Qxe1#
      • 1...Kd3
        • 2.Qd5#
      • 1...Sc2
        • 2.Qd1#
      • 1...Sg2
        • 2.Qd1#
      • 1...Sd3
        • 2.Qd1#
      • 1...Sf3
        • 2.Qd1#

Anticipated by 47715(1991)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAR1(D)
      • Refutation
        • S(a);XQ(D)
    • Try
      • Q(D);CHECK
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(D)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(D);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT::QAR2(D),XS(a)
      • K(b);P-FLIGHT::QAR2(D)
      • S(a);OGATE::QAR1(D)
      • S(a);OGATE,SBLOCK::QAR1(D)
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