MESON Chess Problem Database

Problem Display
PID: 203014 (2B4b/2R5/K7/3k4/pP5R/1n6/4p1PB/7Q w - - 0 1)

Gunn, Robert Ivan

The Observer, 1951

(First published on Sun Jun 17 1951)

2B4b/2R5/K7/3k4/pP5R/1n6/4p1PB/7Q

#2

8 + 5

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.g4#
    • 1...Sa1
      • 2.Rc5#
    • 1...Sc1
      • 2.Rc5#
    • 1...Sd2
      • 2.Rc5#
    • 1...Sd4
      • 2.Rc5#
    • 1...Sa5
      • 2.Rc5#
    • 1...Sc5+
      • 2.Rxc5#
  • Tries
    • 1.Rd7+?
      • 1...Kc6
        • 2.g3#
        • 2.g4#
      • 1...Ke6!
    • 1.Qc1?
      • threat
        • 2.Qc4#
        • 2.Qc6#
      • 1...Sc5+
        • 2.Rxc5#
        • 2.Qxc5#
      • 1...Sxc1
        • 2.Rc5#
      • 1...Be5
        • 2.Qc6#
      • 1...Sd2
        • 2.Rc5#
        • 2.Qc5#
        • 2.Qc6#
      • 1...Sd4
        • 2.Rc5#
        • 2.Qc4#
        • 2.Qc5#
      • 1...Sa5
        • 2.Rc5#
        • 2.Qc5#
      • 1...Bc3!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Rd6#
      • 1...Sc5+
        • 2.Rxc5#
      • 1...Kxc6
        • 2.g4#
      • 1...Bd4
        • 2.g4#
      • 1...Be5
        • 2.g3#
      • 1...Sd4
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(e);SBLOCK::QAB(A)+P(B)
    • S(b);N_GUARD::R1(G)
    • S(b);CHECK,N_GUARD::R1(G),XS(b)
  • Tries
    • Try
      • R(G);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD,XQ(A)::R1(G)
        • B(e);::QAB1(A)
      • Refutation
        • B(e);
  • Actual
    • R(G);
    • Threat
      • R1(G)
    • Vars
      • S(b);CHECK,N_GUARD::R1(G),XS(b)
      • K(d);S_FLIGHT,XR(G)::QAB(A)+P(B)
      • B(e);SBLOCK::QAB(A)+P(B)
      • S(b);N_GUARD::R1(G)
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