MESON Chess Problem Database

Problem Display
PID: 194802 (1B6/4R3/5b2/KPkb1n1R/8/2pQ4/4Npq1/8 w - - 0 1)

Rains, Cyril George

The Observer, 1941

(First published on Sun Sep 14 1941)

1B6/4R3/5b2/KPkb1n1R/8/2pQ4/4Npq1/8

#2

7 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bb3
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bf3
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bc4
      • 2.Bd6#
      • 2.Ba7#
      • 2.Qd6#
    • 1...Be4
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bc6
      • 2.Bd6#
      • 2.Ba7#
    • 1...Be6
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bb7
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bf7
      • 2.Bd6#
      • 2.Ba7#
    • 1...Ba8
      • 2.Bd6#
      • 2.Ba7#
    • 1...Bg8
      • 2.Bd6#
      • 2.Ba7#
    • 1...Sd4
      • 2.Qxc3#
    • 1...Sd6
      • 2.Ba7#
      • 2.Rc7#
  • Tries
    • 1.Bd6+?
      • 1...Sxd6
        • 2.Rc7#
      • 1...Kxd6!
    • 1.Rc7+?
      • 1...Bc6
        • 2.Ba7#
      • 1...Kd6!
  • Keys
    • 1.b6!
      • threat
        • 2.Qb5#
      • 1...Kc6
        • 2.Qb5#
      • 1...Bc4
        • 2.Qd6#
      • 1...Bc6
        • 2.Bd6#
      • 1...Sd4
        • 2.Qxc3#
      • 1...Sd6
        • 2.Rc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(f);P_SPINB(e),S_CUTB(g)::QAR2(B),XP(c)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • S(f);P_SPINB(e),SBLOCK,XB(G)::R(F)
      • Refutation
        • K(d);P_SPINB(e),S_FLIGHT,XB(G)
    • Try
      • R(F);CHECK
      • Vars
        • B(e);P_SPINB(e),P_SPINS(f)::B(G)
      • Refutation
        • K(d);P_SPINB(e),S_FLIGHT
  • Actual
    • P(D);
    • Threat
      • QAR1(B)
    • Vars
      • K(d);P-FLIGHT::QAB1(B)
      • B(e);OGATE,P_SPINS(f),SBLOCK::QAB1(B)
      • B(e);P_SPINS(f),SBLOCK::B(G)
      • S(f);P_SPINB(e),S_CUTB(g)::QAR2(B),XP(c)
      • S(f);P_SPINB(e),SBLOCK::R(F)
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