MESON Chess Problem Database

Problem Display
PID: 157079 (Q7/8/4p3/3r4/4k3/5NPK/3BP1B1/6b1 w - - 0 1)

Ackerman, Ernest

Source?, 1972

Q7/8/4p3/3r4/4k3/5NPK/3BP1B1/6b1

#2

7 + 4

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Tries
    • 1.Qa1?
      • threat
        • 2.Sh4#
      • 1...Kf5
        • 2.Sh4#
      • 1...Rxd2
        • 2.Qe5#
      • 1...Rd3
        • 2.Qe5#
      • 1...Rf5
        • 2.Sg5#
      • 1...Bd4
        • 2.Qb1#
      • 1...Rd4!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Sd4#
        • 2.Sh4#
      • 1...Rh5+
        • 2.Sh4#
      • 1...Kf5
        • 2.Sh4#
      • 1...Rxd2
        • 2.Qe5#
      • 1...Rd3
        • 2.Qe5#
      • 1...Rd4
        • 2.Sxd4#
        • 2.Sh4#
        • 2.Qe5#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rf5
        • 2.Sg5#
      • 1...Bd4
        • 2.Sxd4#
        • 2.Sh4#
      • 1...e5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(G);N_PINR(c)
      • Threat
        • B(C)+S(D)
      • Vars
        • K(b);S_FLIGHT::S(D)
        • R(c);N_GUARD,XB(A)::QAR1(G)
        • R(c);N_GUARD::QAR1(G)
        • R(c);SBLOCK::B(C)+S(D),DCHECK
        • B(a);S_CUTR(c)::QAB(G)
      • Refutation
        • R(c);
  • Actual
    • Q(G);N_PINR(c)
    • Threat
      • DUALS(2)
    • Vars
      • R(c);CHECK::B(C)+S(D)
      • K(b);S_FLIGHT::S(D)
      • R(c);N_GUARD,XB(A)::QAR1(G)
      • R(c);N_GUARD::QAR1(G)
      • R(c);N_GUARD::QAR1(G),XR(c)
      • R(c);SBLOCK::B(C)+S(D),DCHECK
      • P(d);S_CUTR(c)::QAB(G)
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