MESON Chess Problem Database

Problem Display
PID: 2530 (8/8/8/3K4/3p4/3p1kBB/p2RNP2/q7 w - - 0 1)

Mansfield, Comins

The Observer, 1939

(First published on Sun Jun 18 1939)

8/8/8/3K4/3p4/3p1kBB/p2RNP2/q7

#2

6 + 5

3550 Complete Mansfield/II 1997
5454 Near Snap 2015
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Sg1#
    • 1...Qc3
      • 2.Sg1#
    • 1...Qb1
      • 2.Sxd4#
    • 1...Qc1
      • 2.Sxd4#
    • 1...Qd1
      • 2.Sxd4#
    • 1...Qe1
      • 2.Sxd4#
    • 1...Qf1
      • 2.Sxd4#
    • 1...Qg1
      • 2.Sxg1#
      • 2.Sxd4#
    • 1...Qh1
      • 2.Sxd4#
    • 1...dxe2
      • 2.Rd3#
  • Tries
    • 1.Ke5?
      • 1...dxe2
        • 2.Rd3#
      • 1...Qb2
        • 2.Sg1#
      • 1...Qc3
        • 2.Sg1#
      • 1...Qb1
        • 2.Sxd4#
      • 1...Qc1
        • 2.Sxd4#
      • 1...Qd1
        • 2.Sxd4#
      • 1...Qf1
        • 2.Sxd4#
      • 1...Qg1
        • 2.Sxg1#
        • 2.Sxd4#
      • 1...Qh1
        • 2.Sxd4#
      • 1...Qe1!
    • 1.Rb2?
      • threat
        • 2.Sxd4#
      • 1...Qxb2
        • 2.Sg1#
      • 1...dxe2!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Sg1#
      • 1...Kxe2
        • 2.Bg4#
      • 1...Qxd1
        • 2.Sxd4#
      • 1...dxe2
        • 2.Rd3#

This anticipates 25708(1975)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::S(B)
    • Q(a);N_GUARD::S(B),XP(e)
    • P(c);SBLOCK,XS(B)::R(A)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Vars
        • P(c);SBLOCK,XS(B)::R(A)
        • Q(a);N_GUARD::S(B)
        • Q(a);N_GUARD::S(B),XP(e)
      • Refutation
        • Q(a);P_PINS(B)
    • Try
      • R(A);
      • Threat
        • S(B),XP(e)
      • Vars
        • Q(a);N_GUARD,XR(A)::S(B)
      • Refutation
        • P(c);XS(B)
  • Actual
    • R(A);
    • Threat
      • S(B)
    • Vars
      • K(d);S_FLIGHT,XS(B)::B(E)
      • Q(a);N_GUARD,XR(A)::S(B),XP(e)
      • P(c);SBLOCK,XS(B)::R(A)
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