MESON Chess Problem Database

Problem Display
PID: 89918 (2K2b2/8/3R4/p2Q4/kq5R/p7/8/8 w - - 0 1)

Macleod, Norman Alasdair

Die Schwalbe, 1976

2K2b2/8/3R4/p2Q4/kq5R/p7/8/8

#2

4 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4+
      • 2.Qxc4#
    • 1...Qd4
      • 2.Rxd4#
    • 1...Qe4
      • 2.Rxe4#
    • 1...Qf4
      • 2.Rxf4#
    • 1...Qg4+
      • 2.Rxg4#
  • Tries
    • 1.Rxb4+?
      • 1...axb4
        • 2.Ra6#
      • 1...Kxb4!
    • 1.Qb3+?
      • 1...Kb5
        • 2.Rh5#
      • 1...Kxb3!
  • Keys
    • 1.Rb6!
      • threat
        • 2.Qd1#
      • 1...Qc4+
        • 2.Qc6#
      • 1...Qg4+
        • 2.Qd7#
      • 1...a2
        • 2.Qxa2#
      • 1...Qd4
        • 2.Qb3#
        • 2.Qc6#
        • 2.Qb5#
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(c);CHECK,OGATEB::QAR2(B),XQ(c)
    • Q(c);OGATEB::R(A),XQ(c)
    • Q(c);CHECK,OGATEB::R(A),XQ(c)
  • Tries
    • Try
      • R(A);CHECK,XQ(c)
      • Vars
        • P(d);SBLOCK,S_CUTB(e),XR(A)::R(C)
      • Refutation
        • K(b);P-FLIGHT,XR(A)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::R(A)
      • Refutation
        • K(b);N_SPINQ(c),S_FLIGHT,XQ(B)
  • Actual
    • R(C);
    • Threat
      • QAB(B)
    • Vars
      • Q(c);CHECK::QAB(B)
      • P(a);OGATEB::QAR2(B),XP(a)
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