MESON Chess Problem Database

Problem Display
PID: 145956 (2RN4/k2P4/3p4/1PnPR3/N7/5p2/5Bp1/6K1 w - - 0 1)

Lipton, Michael

The Problemist, 1951

2RN4/k2P4/3p4/1PnPR3/N7/5p2/5Bp1/6K1

#2

9 + 5

14867 BCPS Library 2012
5454 Near Snap 2012

SOLUTION

  • SOUND
  • Sets
    • 1...dxe5
      • 2.Bxc5#
  • Tries
    • 1.Sb2?
      • 1...dxe5
        • 2.Bxc5#
      • 1...Kb6!
    • 1.Sc3?
      • 1...dxe5
        • 2.Bxc5#
      • 1...Kb6!
    • 1.Sxc5?
      • threat
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sa6#
        • 2.Sce6#
        • 2.Scb7#
      • 1...dxc5
        • 2.Bxc5#
      • 1...Kb6!
    • 1.Be3?
      • 1...dxe5
        • 2.Bxc5#
      • 1...f2+!
    • 1.Bd4?
      • 1...dxe5
        • 2.Bxc5#
      • 1...f2+!
    • 1.Rxc5?
      • threat
        • 2.Rc8#
      • 1...Ka8
        • 2.Rc8#
      • 1...Kb8
        • 2.Rc8#
      • 1...dxc5!
  • Keys
    • 1.Re3!
      • 1...Sxa4
        • 2.Ra3#
      • 1...Sxd7
        • 2.Re7#
      • 1...Sb3
        • 2.Rxb3#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Se4
        • 2.Rxe4#
      • 1...Sa6
        • 2.b6#
      • 1...Se6
        • 2.Rxe6#
      • 1...Sb7
        • 2.Sc6#

Anticipated by 140100(1916), 58111(1928), 139043(1937), 140101(1938), 157162(1946)

This anticipates 227985(1970)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • P(d);N_GUARD,XR(F)::B(B),XS(c)
  • Tries
    • Try
      • S(C);
      • Vars
        • P(d);N_GUARD,XR(F)::B(B),XS(c)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • S(C);
      • Vars
        • P(d);N_GUARD,XR(F)::B(B),XS(c)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • S(C);XS(c)
      • Threat
        • DUALS(7)
      • Vars
        • P(d);OGATE,P_SPINP(d),XS(C)::B(B),XP(d)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • P(d);N_GUARD,XR(F)::B(B),XS(c)
      • Refutation
        • P(b);CHECK
    • Try
      • B(B);
      • Vars
        • P(d);N_GUARD,XR(F)::B(B),XS(c)
      • Refutation
        • P(b);CHECK
    • Try
      • R(H);XS(c)
      • Threat
        • B(B)+R(H)
      • Vars
        • K(e);P-FLIGHT::R(H)
        • K(e);S_FLIGHT::R1(H)
      • Refutation
        • P(d);P_SPINP(d),XR(H)
  • Actual
    • R(F);N_PINS(c)
    • Vars
      • S(c);OGATEB,XS(C)::B(B)+R(F)
      • S(c);OGATEB,XP(G)::B(B)+R(F)
      • S(c);OGATEB::B(B)+R(F),XS(c)
      • S(c);SBLOCK::P(D)
      • S(c);SBLOCK::S(I)
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