MESON Chess Problem Database

Problem Display
PID: 5979 (1B4Q1/4K3/4p3/1PNk1b1R/3p2nR/PN1p4/B2P4/b3rnr1 w - - 0 1)

Easter, Norris

1st Prize, Bristol Times and Mirror, 1926

1B4Q1/4K3/4p3/1PNk1b1R/3p2nR/PN1p4/B2P4/b3rnr1

#2

11 + 10

5862 An ABC of Chess Problems 1970
4640 Chess Wizardry: The New ABC of Chess Problems 1996
23 Die Schwalbe 2009
5454 Near Snap 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Qxe6#
    • 1...Rc1
      • 2.Qxe6#
    • 1...Rd1
      • 2.Qxe6#
    • 1...Sfe3
      • 2.Qxe6#
    • 1...Sge3
      • 2.Qxe6#
  • Tries
    • 1.Sxd4+?
      • 1...Kxc5
        • 2.Ba7#
      • 1...Kxd4!
    • 1.Rxf5+?
      • 1...Re5
        • 2.Qxe6#
      • 1...Se5
        • 2.Qxe6#
      • 1...Kc4!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Sc5#
      • 1...Rxe6+
        • 2.Qxe6#
      • 1...Kc4
        • 2.Sxd4#
      • 1...Ke4
        • 2.Sg5#
      • 1...Sxd2
        • 2.Sxd2#
      • 1...Rb1
        • 2.Sec5#
      • 1...Rc1
        • 2.Sec5#
      • 1...Sfe3
        • 2.Sec5#
      • 1...Sge3
        • 2.Sg7#
      • 1...Se5
        • 2.Sc7#

This anticipates 134223(1962)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::QAB1(K),XP(j)
    • S(c);S_CUTR(b)::QAB1(K),XP(j)
    • S(g);S_CUTR(b)::QAB1(K),XP(j)
  • Tries
    • Try
      • S(D);CHECK,XP(f)
      • Vars
        • K(h);N_SPINP(j),P-FLIGHT,XS(G)::B(J)
      • Refutation
        • K(h);N_SPINB(i),N_SPINP(j),P-FLIGHT,P_SPINS(g),XS(D)
    • Try
      • R(H);CHECK,XB(i)
      • Vars
        • R(b);P_SPINR(b)::QAB1(K),XP(j)
        • S(g);P_SPINS(g)::QAB1(K),XP(j)
      • Refutation
        • K(h);S_FLIGHT
  • Actual
    • S(G);P_SPINS(G),XP(j)
    • Threat
      • B(A)+S(D)
    • Vars
      • R(b);CHECK,OGATE,P_SPINR(b),XS(G)::QAB1(K),XR(b)
      • K(h);N_SPINB(i),S_FLIGHT::B(A)+S(D),XP(f)
      • K(h);N_PINS(G),N_SPINB(i),P_SPINS(g),S_FLIGHT::S(G)
      • S(c);XP(B)::B(A)+S(D),XS(c)
      • R(b);N_PINS(G)::QAB(K)+S(G)
      • S(c);N_PINS(G)::QAB(K)+S(G)
      • S(g);N_PINS(G)::QAB(K)+S(G)
      • S(g);N_PINS(G),N_SPINB(i),SBLOCK::QAB(K)+S(G),DCHECK
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