MESON Chess Problem Database

Problem Display
PID: 76661 (3B4/p6p/k5qR/1p2p2b/6p1/3Q2p1/6B1/1K6 w - - 0 1)

Holladay, Edgar Dinwiddie

The Observer, 1951

(First published on Sun Jul 8 1951)

3B4/p6p/k5qR/1p2p2b/6p1/3Q2p1/6B1/1K6

#2

5 + 9

6232 Holladay Chess Problems 2007
145 StrateGems 2008
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Qa3#
    • 1...Qd6
      • 2.Rxd6#
      • 2.Qa3#
      • 2.Qxd6#
    • 1...Qe6
      • 2.Rxe6#
      • 2.Qa3#
    • 1...Qf6
      • 2.Rxf6#
      • 2.Qa3#
    • 1...Qxh6
      • 2.Qa3#
  • Tries
    • 1.Ba8?
      • 1...Qxh6
        • 2.Qa3#
      • 1...Qb6
        • 2.Qa3#
      • 1...Qc6
        • 2.Rxc6#
        • 2.Qa3#
      • 1...Qd6
        • 2.Rxd6#
        • 2.Qa3#
        • 2.Qxd6#
      • 1...Qe6
        • 2.Rxe6#
        • 2.Qa3#
      • 1...Qf6
        • 2.Rxf6#
        • 2.Qa3#
      • 1...e4
        • 2.Qa3#
      • 1...g2!
    • 1.Rxg6+?
      • 1...hxg6
        • 2.Qa3#
        • 2.Qd6#
      • 1...Bxg6!
    • 1.Qe4?
      • 1...Qxh6
        • 2.Qb7#
      • 1...Qc6
        • 2.Qxc6#
      • 1...b4
        • 2.Bf1#
        • 2.Qd3#
      • 1...Qd6
        • 2.Rxd6#
        • 2.Qb7#
      • 1...Qe6
        • 2.Rxe6#
        • 2.Qb7#
      • 1...Qf6
        • 2.Rxf6#
        • 2.Qb7#
      • 1...Qb6!
    • 1.Qf5?
      • 1...Qxh6
        • 2.Qc8#
      • 1...Qc6
        • 2.Qc8#
      • 1...b4
        • 2.Qd3#
      • 1...e4
        • 2.Qc8#
      • 1...Qd6
        • 2.Rxd6#
        • 2.Qc8#
      • 1...Qe6
        • 2.Rxe6#
        • 2.Qxe6#
      • 1...Qf6
        • 2.Rxf6#
        • 2.Qc8#
        • 2.Qxf6#
      • 1...Qb6!
  • Keys
    • 1.Qc2!
      • 1...Qxh6
        • 2.Qa2#
        • 2.Qc8#
      • 1...Qb6
        • 2.Qa2#
      • 1...Qc6
        • 2.Qxc6#
      • 1...b4
        • 2.Qd3#
      • 1...e4
        • 2.Qc8#
      • 1...Qd6
        • 2.Rxd6#
        • 2.Qa2#
        • 2.Qc8#
      • 1...Qe6
        • 2.Rxe6#
        • 2.Qa2#
        • 2.Qc8#
      • 1...Qf6
        • 2.Rxf6#
        • 2.Qa2#
        • 2.Qc8#

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(g);N_PINQ(C)::QAR(C)
    • Q(g);N_PINQ(C),N_SPINQ(g),SBLOCK,XR(D)::QAR(C)
  • Tries
    • Try
      • B(B);
      • Vars
        • Q(g);N_PINQ(C),N_SPINQ(g),SBLOCK,XR(D)::QAR(C)
        • Q(g);N_PINQ(C)::QAR(C)
        • P(d);N_PINQ(C)::QAR(C)
      • Refutation
        • P(a);
    • Try
      • R(D);CHECK,N_SPINQ(C),XQ(g)
      • Refutation
        • B(e);P_PINQ(C),XR(D)
    • Try
      • Q(C);N_PINP(c)
      • Vars
        • Q(g);N_PINQ(C),N_SPINQ(g),SBLOCK,XR(D)::QAB1(C)
        • Q(g);N_PINQ(C)::QAR2(C),XQ(g)
      • Refutation
        • Q(g);N_PINQ(C)
    • Try
      • Q(C);N_PINP(c)
      • Vars
        • Q(g);N_PINQ(C),N_SPINQ(g),SBLOCK,XR(D)::QAB(C)
        • Q(g);N_PINQ(C)::QAB(C)
        • P(c);::QAB(C)
        • P(d);N_PINQ(C)::QAB(C)
      • Refutation
        • Q(g);N_PINQ(C)
  • Actual
    • Q(C);N_PINP(c)
    • Vars
      • Q(g);N_PINQ(C)::QAR(C)
      • Q(g);N_PINQ(C)::QAR2(C),XQ(g)
      • P(c);::QAB(C)
      • P(d);N_PINQ(C)::QAB(C)
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