MESON Chess Problem Database

Problem Display
PID: 44053 (7K/8/3P4/p2rR3/P2Nr2p/P1k4P/B3p3/2B1N1Q1 w - - 0 1)

Thomson, Robert Gavin

London Opinion, 1908

7K/8/3P4/p2rR3/P2Nr2p/P1k4P/B3p3/2B1N1Q1

#2

11 + 6

15 British Chess Magazine 1911
20 De Problemist 1931
5454 Near Snap 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Qxe3#
    • 1...Rf4
      • 2.Sxe2#
      • 2.Qe3#
    • 1...Rg4
      • 2.Sxe2#
      • 2.Qe3#
    • 1...Rb5
      • 2.Sxb5#
    • 1...Rc5
      • 2.Rxc5#
    • 1...Rxd6
      • 2.Sb5#
      • 2.Rc5#
  • Tries
    • 1.Rxe4?
      • threat
        • 2.Sxe2#
        • 2.Qe3#
      • 1...Rxd4
        • 2.Qxd4#
      • 1...Rh5+!
    • 1.Rxd5?
      • threat
        • 2.Sb5#
        • 2.Rc5#
      • 1...Rxd4
        • 2.Qxd4#
      • 1...Re3
        • 2.Sb5#
        • 2.Qxe3#
      • 1...Re5
        • 2.Sb5#
      • 1...Re8+!
    • 1.Qg3+?
      • 1...Kxd4
        • 2.Rxd5#
      • 1...Re3
        • 2.Sxe2#
        • 2.Qxe3#
      • 1...hxg3!
  • Keys
    • 1.Qg7!
      • 1...Kxd4
        • 2.Rxd5#
      • 1...Rexd4
        • 2.Re3#
      • 1...Rexe5
        • 2.Sxe2#
      • 1...Rdxd4
        • 2.Rc5#
      • 1...Rdxe5
        • 2.Sb5#
      • 1...Rxd6
        • 2.Sb5#
        • 2.Rc5#
      • 1...Re3
        • 2.Rxe3#
      • 1...Rf4
        • 2.Sxe2#
        • 2.Re3#
      • 1...Rg4
        • 2.Sxe2#
        • 2.Re3#
      • 1...Rb5
        • 2.Sxb5#
      • 1...Rc5
        • 2.Rxc5#

This anticipates 148146(1920)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAR2(C),XR(c)
    • R(f);N_GUARD::S(H),XR(f)
    • R(f);OGATE::R(I),XR(f)
  • Tries
    • Try
      • R(I);XR(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);OGATE,XS(H)::QAB1(C),XR(f)
      • Refutation
        • R(f);CHECK
    • Try
      • R(I);XR(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);OGATE,XS(H)::QAB1(C),XR(c)
        • R(c);::S(H)
      • Refutation
        • R(c);CHECK
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT,XS(H)::R1(I),XR(f)
      • Refutation
        • P(d);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(H)::QAB(C)+R(I),DCHECK,XR(f)
      • R(c);OGATE,XS(H)::R(I)
      • R(c);N_GUARD,XR(I)::S(H),XP(a)
      • R(f);OGATE,XS(H)::R(I)
      • R(f);N_GUARD,XR(I)::S(H)
      • R(c);OGATE::R(I),XR(c)
      • R(f);N_GUARD::S(H),XR(f)
      • R(f);OGATE::R(I),XR(f)
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