MESON Chess Problem Database

Problem Display
PID: 69832 (8/1R1P3p/3kp3/q1Np2Q1/1Np1p2r/Bp2p2p/4P3/1K1R4 w - - 0 1)

Aloni, Yoel

Navon, Emanuel

Shahmat, 1999

8/1R1P3p/3kp3/q1Np2Q1/1Np1p2r/Bp2p2p/4P3/1K1R4

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc5
      • 2.Qe7#
    • 1...Qxc5
      • 2.d8Q#
      • 2.d8R#
    • 1...Rh5
      • 2.Sxe4#
    • 1...Rh6
      • 2.Sxe4#
    • 1...d4
      • 2.Rxd4#
    • 1...e5
      • 2.Rxd5#
  • Tries
    • 1.Qf4+?
      • 1...Kxc5
        • 2.Qf8#
      • 1...Ke7
        • 2.Sc6#
      • 1...e5
        • 2.Qf8#
      • 1...Rxf4!
    • 1.Qxd5+?
      • 1...Ke7
        • 2.d8Q#
      • 1...exd5!
    • 1.d8Q+?
      • 1...Kxc5
        • 2.Qge7#
        • 2.Qde7#
        • 2.Qf8#
      • 1...Qxd8!
    • 1.d8R+?
      • 1...Kxc5
        • 2.Qe7#
      • 1...Qxd8!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Sb4#
      • 1...Kc6
        • 2.Se7#
      • 1...Qxc5
        • 2.Se7#
      • 1...exd5
        • 2.Qf6#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qe1
        • 2.Rb6#
      • 1...Qd2
        • 2.Rb6#
      • 1...Qc3
        • 2.Rb6#
      • 1...e5
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 4
  • Sets
    • K(i);S_FLIGHT,XS(F)::QAB(G)
    • Q(g);N_GUARD,SBLOCK,XS(F)::P=Q
    • R(f);N_GUARD::S(F),XP(e)
    • P(h);OGATEB::R(B),XP(h)
    • P(j);N_GUARD::R1(B),XP(h)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • K(i);N_SPINP(h),S_FLIGHT,XS(F)::QAB(G)
        • K(i);N_SPINP(h),S_FLIGHT::S(E)
        • P(j);SBLOCK::QAB(G)
      • Refutation
        • R(f);XQ(G)
    • Try
      • Q(G);CHECK,XP(h)
      • Vars
        • K(i);S_FLIGHT::P=Q
      • Refutation
        • P(j);P_SPINP(j),XQ(G)
    • Try
      • P(I);CHECK
      • Refutation
        • Q(g);XQ(I)
    • Try
      • P(I);CHECK
      • Vars
        • K(i);S_FLIGHT,XS(F)::QAB(G)
      • Refutation
        • Q(g);XR(I)
  • Actual
    • S(E);XP(h)
    • Threat
      • R(B)+S(E)
    • Vars
      • K(i);P-FLIGHT::S(E)
      • Q(g);N_GUARD,P_SPINQ(g),XS(F)::R(B)+S(E)
      • P(j);OGATEB,P_SPINP(j),XS(E)::QAR2(G)
      • Q(g);::R(B)+S(E),XQ(g)
      • Q(g);N_GUARD,P_PINR(B)::R(H)
      • Q(g);N_GUARD::R(H)
      • P(j);OGATEB::QAR2(G)
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Developed and maintained by Brian Stephenson.
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