MESON Chess Problem Database

Problem Display
PID: 52915 (8/8/5p2/5R2/1p2kN2/1KnN4/5P2/6Q1 w - - 0 1)

Ervo, Ilmari

1st HM., Source?, 0000

8/8/5p2/5R2/1p2kN2/1KnN4/5P2/6Q1

#2

6 + 4

117 Suomen Shakki 1926

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Qg2#
    • 1...Kd4
      • 2.f3#
    • 1...Kxf5
      • 2.Qg6#
  • Tries
    • 1.Sc5+?
      • 1...Kf3
        • 2.Qg2#
        • 2.Qg3#
      • 1...Kd4
        • 2.Sfe6#
        • 2.f3#
      • 1...Kxf5!
    • 1.Rd5?
      • threat
        • 2.Qh1#
        • 2.Qg2#
      • 1...Kf3
        • 2.Qg2#
      • 1...Sxd5!
    • 1.Re5+?
      • 1...Kf3
        • 2.Re3#
        • 2.Qg2#
        • 2.Qg3#
      • 1...Kd4
        • 2.f3#
      • 1...fxe5!
    • 1.Qg2+?
      • 1...Kxf5
        • 2.Qg6#
      • 1...Kd4!
    • 1.f3+?
      • 1...Kxf5
        • 2.Qg4#
        • 2.Qg6#
      • 1...Kxf3!
  • Keys
    • 1.Qg8!
      • 1...Kf3
        • 2.Qg2#
      • 1...Kd4
        • 2.Qc4#
      • 1...Kxf5
        • 2.Qg6#
      • 1...Sb1
        • 2.Qd5#
      • 1...Sd1
        • 2.Qd5#
      • 1...Sa2
        • 2.Qd5#
      • 1...Se2
        • 2.Qd5#
      • 1...Sa4
        • 2.Qd5#
      • 1...Sb5
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT::QAB1(A)
    • K(c);P-FLIGHT::QAB(A)+P(B)
    • K(c);OGATEB,S_FLIGHT,XR(F)::QAB1(A)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(c);S_FLIGHT,XR(F)
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
      • Refutation
        • S(a);XR(F)
    • Try
      • R(F);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(A)+P(B)
      • Refutation
        • P(d);XR(F)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);OGATEB,S_FLIGHT,XR(F)::QAB1(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(B);CHECK
      • Refutation
        • K(c);S_FLIGHT,XP(B)
  • Actual
    • Q(A);
    • Vars
      • K(c);S_FLIGHT::QAB1(A)
      • K(c);P-FLIGHT::QAR1(A)
      • K(c);OGATEB,S_FLIGHT,XR(F)::QAB1(A)
      • S(a);N_GUARD::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
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