MESON Chess Problem Database

Problem Display
PID: 101147 (r2k1K2/2p1N3/4P3/2P5/2p5/b2p4/R2Q4/8 w - - 0 1)

Nield, Joshua

Good Companions, 1918

r2k1K2/2p1N3/4P3/2P5/2p5/b2p4/R2Q4/8

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.Sc6#
    • 1...Bc1
      • 2.Rxa8#
    • 1...Bb2
      • 2.Rxa8#
    • 1...Bb4
      • 2.Rxa8#
    • 1...Bxc5
      • 2.Rxa8#
    • 1...c3
      • 2.Qxd3#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qd4#
      • 1...Bxc5
        • 2.Rxa8#
      • 1...Bb2
        • 2.Rxa8#
      • 1...c6
        • 2.Qd6#
      • 1...Ra6!
    • 1.Qb2?
      • threat
        • 2.Qd4#
      • 1...Bxb2
        • 2.Rxa8#
      • 1...Bxc5
        • 2.Rxa8#
      • 1...c6
        • 2.Qb6#
      • 1...Ra6
        • 2.Qb8#
      • 1...c3!
  • Keys
    • 1.Qb4!
      • 1...Bxb4
        • 2.Rxa8#
      • 1...c6
        • 2.Qb6#
      • 1...Ra4
        • 2.Qb8#
      • 1...Ra5
        • 2.Qb8#
      • 1...Ra6
        • 2.Qb8#
      • 1...Ra7
        • 2.Qb8#
      • 1...Rb8
        • 2.Qxb8#
      • 1...Rc8
        • 2.Sc6#
      • 1...Bc1
        • 2.Rxa8#
      • 1...Bb2
        • 2.Rxa8#
      • 1...d2
        • 2.Rxd2#
        • 2.Qxd2#
      • 1...c3
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(e);SBLOCK::S(E)
    • B(a);OGATE::R(A),XR(e)
    • B(a);OGATE,P_PINS(E),XP(C)::R(A),XR(e)
    • P(c);N_GUARD::QAR(B),XP(b)
  • Tries
    • Try
      • Q(B);N_PINP(b)
      • Threat
        • QAR(B)
      • Vars
        • B(a);OGATE,P_PINS(E),XP(C)::R(A),XR(e)
        • B(a);OGATE::R(A),XR(e)
        • P(d);N_GUARD::QAR2(B)
      • Refutation
        • R(e);
    • Try
      • Q(B);N_PINP(b)
      • Threat
        • QAR(B)
      • Vars
        • B(a);OGATE,XQ(B)::R(A),XR(e)
        • B(a);OGATE,P_PINS(E),XP(C)::R(A),XR(e)
        • P(d);OGATEB::QAB(B)
        • R(e);N_GUARD::QAR2(B)
      • Refutation
        • P(c);
  • Actual
    • Q(B);N_PINP(b)
    • Vars
      • B(a);OGATE,XQ(B)::R(A),XR(e)
      • P(d);OGATEB::QAB(B)
      • R(e);N_GUARD::QAR2(B)
      • R(e);N_GUARD::QAR2(B),XR(e)
      • R(e);SBLOCK::S(E)
      • B(a);OGATE::R(A),XR(e)
      • P(c);OGATE::QAR(B)
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