MESON Chess Problem Database

Problem Display
PID: 99367 (3nq3/3kP1R1/1K1N1P2/2P3P1/4N3/8/4R3/8 w - - 0 1)

Revesz, Janos

Magyar Sakkelet, 1990

3nq3/3kP1R1/1K1N1P2/2P3P1/4N3/8/4R3/8

#2

9 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qh5
      • 2.e8Q#
    • 1...Qg6
      • 2.e8Q#
    • 1...Qf7
      • 2.e8Q#
    • 1...Qxe7
      • 2.Rxe7#
    • 1...Qf8
      • 2.exf8S#
      • 2.e8Q#
    • 1...Qg8
      • 2.e8Q#
    • 1...Qh8
      • 2.e8Q#
    • 1...Se6
      • 2.c6#
  • Tries
    • 1.exd8Q+?
      • 1...Ke6
        • 2.Sc3#
      • 1...Kxd8!
    • 1.exd8R+?
      • 1...Ke6
        • 2.Sc3#
      • 1...Kxd8!
  • Keys
    • 1.f7!
      • threat
        • 2.Sf6#
      • 1...Ke6
        • 2.Sf6#
      • 1...Kxe7
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qxf7
        • 2.e8Q#
      • 1...Qxe7
        • 2.f8S#
      • 1...Se6
        • 2.fxe8Q#
        • 2.fxe8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(c);OGATE::P=Q
    • Q(c);OGATE,P_SPINQ(c),XP(H)::R1(I),XQ(c)
    • S(b);N_GUARD,SBLOCK::P(C)
  • Tries
    • Try
      • P(H);CHECK,XS(b)
      • Vars
        • K(a);S_FLIGHT::R(A)+S(B)
      • Refutation
        • K(a);P-FLIGHT,XQ(H)
    • Try
      • P(H);CHECK,XS(b)
      • Vars
        • K(a);S_FLIGHT::R(A)+S(B)
      • Refutation
        • K(a);P-FLIGHT,XR(H)
  • Actual
    • P(G);
    • Threat
      • S(B)
    • Vars
      • K(a);S_FLIGHT::R(A)+S(B)
      • K(a);P-FLIGHT,XP(H)::PXQ(c)=Q
      • Q(c);OGATE,XP(G)::P=Q
      • Q(c);N_GUARD,XP(H)::P=S
      • S(b);SBLOCK::PXQ(c)=Q
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