MESON Chess Problem Database

Problem Display
PID: 271579 (7b/3N4/1KP5/1N1k1p2/1r1p3r/BR3P1p/4Q3/8 w - - 0 1)

Savournin, Jacques

The Observer, 1960

(First published on Sun Jun 26 1960)

7b/3N4/1KP5/1N1k1p2/1r1p3r/BR3P1p/4Q3/8

#2

8 + 7

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Sc7#
    • 1...Rc4
      • 2.Sc7#
    • 1...Rxb5+
      • 2.Rxb5#
    • 1...Bf6
      • 2.Sxf6#
  • Tries
    • 1.Qc4+?
      • 1...Rxc4
        • 2.Sc7#
      • 1...Kxc4!
    • 1.Qe5+?
      • 1...Kc4
        • 2.Qe6#
      • 1...Bxe5!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Rxb4#
      • 1...Rxb5+
        • 2.Rxb5#
      • 1...Kc4
        • 2.Rc3#
      • 1...Ke6
        • 2.Re3#
      • 1...Rxb3
        • 2.Qxb3#
      • 1...Ra4
        • 2.Rb4#
      • 1...Rc4
        • 2.Sc7#
      • 1...d3
        • 2.Rxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(b);N_PINS(E)::S(E)
    • R(b);CHECK,OGATE,XS(E)::R(C),XR(b)
    • B(g);N_GUARD::S(H),XB(g)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_PINS(E),SBLOCK,XQ(A)::S(E)
      • Refutation
        • K(e);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);N_GUARD,S_FLIGHT::QAB(A)
      • Refutation
        • B(g);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+R(C),XR(b)
    • Vars
      • R(b);CHECK,OGATE,XS(E)::QAB(A)+R(C),DCHECK,XR(b)
      • K(e);S_FLIGHT::QAB(A)+R(C),DCHECK
      • R(b);OGATE,P_SPINR(b),XR(C)::QAB(A),XR(b)
      • R(b);N_PINS(E)::QAB(A)+R(C)
      • R(b);N_PINS(E),SBLOCK::S(E)
      • P(c);::QAB(A)+R(C),DCHECK,XP(c)
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