MESON Chess Problem Database

Problem Display
PID: 233396 (2nQn3/3Rp3/8/2N1k3/3pP3/5K2/8/8 w - - 0 1)

Koltanowski, George

Chess Life & Review, 1972

2nQn3/3Rp3/8/2N1k3/3pP3/5K2/8/8

#2

5 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qxe7#
    • 1...Scd6
      • 2.Qxe7#
    • 1...Sa7
      • 2.Qxe7#
    • 1...Sed6
      • 2.Qh8#
    • 1...Sc7
      • 2.Qh8#
    • 1...e6
      • 2.Sd3#
      • 2.Qg5#
  • Tries
    • 1.Rxe7+?
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Kf6!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Sd3#
        • 2.Re6#
      • 1...Scxd6
        • 2.Qxe7#
      • 1...Sexd6
        • 2.Qh8#
      • 1...exd6
        • 2.Qg5#
      • 1...Sc7
        • 2.Sd3#
      • 1...Sg7
        • 2.Sd3#
      • 1...d3
        • 2.Sxd3#
        • 2.Re6#
      • 1...e6
        • 2.Sd3#
        • 2.Rxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD::QAR2(E),XP(c)
    • S(e);OGATE::QAB(E)
  • Tries
    • Try
      • R(D);CHECK,XP(c)
      • Vars
        • S(d);OGATE,XR(D)::QAR2(E),XS(d)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(D);
    • Threat
      • DUALS(2)
    • Vars
      • S(d);N_GUARD,XR(D)::QAR2(E),XP(c)
      • S(e);OGATE,SBLOCK,XR(D)::QAB(E)
      • P(c);OGATE,SBLOCK,XR(D)::QAR2(E)
      • S(e);::S(C)
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