MESON Chess Problem Database

Problem Display
PID: 189453 (3K4/3N4/4k3/3b2R1/8/1nn4P/8/3Q4 w - - 0 1)

Ferber, Eugene

Reclam-Sammlung VI, 1911

3K4/3N4/4k3/3b2R1/8/1nn4P/8/3Q4

#2

5 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Rg6#
    • 1...Sb1
      • 2.Qxd5#
    • 1...Sa2
      • 2.Qxd5#
    • 1...Se2
      • 2.Qxd5#
    • 1...Sa4
      • 2.Qxd5#
    • 1...Se4
      • 2.Qxd5#
    • 1...Sb5
      • 2.Qxd5#
  • Tries
    • 1.Rg6+?
      • 1...Kf5
        • 2.Qg4#
      • 1...Kf7!
    • 1.Qg4+?
      • 1...Kf7
        • 2.Rg7#
        • 2.Qf5#
      • 1...Kd6!
    • 1.Qd3?
      • threat
        • 2.Qg6#
      • 1...Kd6
        • 2.Rg6#
      • 1...Kf7
        • 2.Qf5#
        • 2.Qg6#
      • 1...Se4
        • 2.Qxd5#
      • 1...Be4!
    • 1.Qd4?
      • threat
        • 2.Qf6#
      • 1...Kd6
        • 2.Rg6#
      • 1...Kf7
        • 2.Qf6#
      • 1...Se4
        • 2.Qxd5#
      • 1...Sxd4!
  • Keys
    • 1.Rf5!
      • threat
        • 2.Rf6#
      • 1...Kxf5
        • 2.Qg4#
      • 1...Kd6
        • 2.Rf6#
      • 1...Se4
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • K(d);P-FLIGHT,P_SPINB(c)::R(C)
    • S(b);N_GUARD::QAB1(A),XB(c)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB1(A)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(d);P-FLIGHT,P_SPINB(c)::R(C)
        • S(b);N_GUARD::QAB1(A),XB(c)
      • Refutation
        • B(c);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(d);P-FLIGHT,P_SPINB(c)::R(C)
        • K(d);S_FLIGHT::QAR1(A)
        • S(b);N_GUARD::QAB1(A),XB(c)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XR(C)::QAB1(A)
      • K(d);P-FLIGHT,P_SPINB(c)::R(C)
      • S(b);N_GUARD::QAB1(A),XB(c)
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