MESON Chess Problem Database

Problem Display
PID: 17 (3R3B/p1p5/2n1r1p1/b2PN1r1/KPBkN2Q/5Pq1/5P2/8 w - - 0 1)

Easter, Norris

1st Prize=, BCPS, 1930

3R3B/p1p5/2n1r1p1/b2PN1r1/KPBkN2Q/5Pq1/5P2/8

#2

11 + 9

3098 FIDE Album (1914-1944) (I) 1971
3639 Hastings Solving Ty. 2001-2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf2
      • 2.Qxf2#
  • Tries
    • 1.Sd2+?
      • 1...Qf4
        • 2.Sxc6#
      • 1...Qxh4
        • 2.Sxc6#
      • 1...Qg4
        • 2.Sxc6#
      • 1...Rg4
        • 2.Sxc6#
      • 1...Kc3!
    • 1.Sc3+?
      • 1...Qf4
        • 2.Se2#
        • 2.Sb5#
      • 1...Qxh4
        • 2.Se2#
        • 2.Sb5#
      • 1...Qg4
        • 2.Se2#
        • 2.Sb5#
      • 1...Rg4
        • 2.Se2#
        • 2.Sb5#
      • 1...Kxc3!
    • 1.Sxg3+?
      • 1...Rg4
        • 2.Se2#
      • 1...Kc3!
    • 1.Sd6+?
      • 1...Qf4
        • 2.Sxc6#
        • 2.Sb5#
      • 1...Qxh4
        • 2.Sxc6#
        • 2.Sb5#
      • 1...Qg4
        • 2.Sxc6#
        • 2.Sb5#
      • 1...Rg4
        • 2.Sxc6#
        • 2.Sb5#
      • 1...Kc3!
  • Keys
    • 1.Kb3!
      • threat
        • 2.Sxc6#
      • 1...Qxf3+
        • 2.Sxf3#
      • 1...Qxf2
        • 2.Qxf2#
      • 1...Qxe5
        • 2.Sxg5#
      • 1...Rgxe5
        • 2.Sxg3#
      • 1...Rexe5
        • 2.dxc6#
      • 1...Sxb4
        • 2.Sc6#
      • 1...Sxe5
        • 2.dxe6#
      • 1...Sxd8
        • 2.Sc6#
      • 1...Se7
        • 2.Sc6#
      • 1...Sb8
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • Q(a);OGATE,XP(A)::QAB(G),XQ(a)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::B(K)+S(I),DCHECK,XS(e)
        • Q(a);XQ(G)::B(K)+S(I),DCHECK,XS(e)
        • R(d);P_SPINR(d)::B(K)+S(I),DCHECK,XS(e)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Refutation
        • K(b);S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK,XQ(a)
      • Vars
        • R(d);P_SPINR(d)::S(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • K(C);P_SPINP(B),S_FLIGHT
    • Threat
      • B(K)+S(I),DCHECK,XS(e)
    • Vars
      • Q(a);CHECK,XP(B)::B(K)+S(I),DCHECK,XQ(a)
      • Q(a);N_PINP(B),OGATE,XP(A)::QAB(G),XQ(a)
      • Q(a);N_GUARD,N_PINP(B),P_SPINQ(a),XS(I)::QAR(G)+S(F),XR(d)
      • R(d);N_GUARD,P_SPINR(d),XS(I)::QAR(G)+S(F),XQ(a)
      • R(f);N_GUARD,P_SPINR(f),XS(I)::R(J)+P(H),XS(e)
      • S(e);XP(D)::B(K)+S(I),DCHECK
      • S(e);N_GUARD,P_SPINS(e),XS(I)::R(J)+P(H),XR(f)
      • S(e);XR(J)::B(K)+S(I),DCHECK
      • S(e);::B(K)+S(I),DCHECK
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