MESON Chess Problem Database

Problem Display
PID: 87386 (3K4/7n/1N6/4kBp1/1P1R2P1/4p3/Q7/8 w - - 0 1)

Vovan, Nguyen

Apprenti Sorcier, 1991

3K4/7n/1N6/4kBp1/1P1R2P1/4p3/Q7/8

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qa1#
      • 2.Qb2#
  • Tries
    • 1.Ke7?
      • threat
        • 2.Re4#
        • 2.Qd5#
      • 1...Kxd4
        • 2.Qa1#
        • 2.Qb2#
      • 1...Sf6!
    • 1.Re4+?
      • 1...Kd6
        • 2.Re6#
        • 2.Qd5#
        • 2.Qe6#
      • 1...Kf6!
    • 1.Qa1?
      • threat
        • 2.Sd7#
      • 1...Kf6
        • 2.Rd7#
      • 1...Sf6
        • 2.Sc4#
      • 1...Sf8!
    • 1.Qb2?
      • threat
        • 2.Sd7#
      • 1...Kf6
        • 2.Rd7#
      • 1...Sf6
        • 2.Sc4#
      • 1...Sf8!
    • 1.Qh2+?
      • 1...Kxd4
        • 2.Qb2#
      • 1...Kf6!
    • 1.Qa5+?
      • 1...Kxd4
        • 2.Qa1#
        • 2.Qc5#
      • 1...Kf6!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Sd7#
      • 1...Kxd4
        • 2.Qa1#
      • 1...Kf6
        • 2.Qe7#
      • 1...Sf6
        • 2.Sc4#
      • 1...Sf8
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(G);S_FLIGHT
      • Threat
        • DUALS(2)
      • Refutation
        • S(d);
    • Try
      • R(C);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • S(F)
      • Vars
        • K(b);S_FLIGHT::QAB(A)+R(C)
        • S(d);SBLOCK::S(F)
      • Refutation
        • S(d);
    • Try
      • Q(A);
      • Threat
        • S(F)
      • Vars
        • K(b);S_FLIGHT::QAB(A)+R(C)
        • S(d);SBLOCK::S(F)
      • Refutation
        • S(d);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATEB,S_FLIGHT,XR(C)::QAB(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • S(F)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(C)::QAB(A)
      • K(b);S_FLIGHT::QAB1(A)
      • S(d);SBLOCK::S(F)
      • S(d);N_GUARD::QAB(A)
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