MESON Chess Problem Database

Problem Display
PID: 110716 (8/7Q/p1NP4/P2Pp3/PKP2p2/p2pkp2/R3nn2/4R1B1 w - - 0 1)

Easter, Norris

2nd HM., Grantham Journal, 1927

8/7Q/p1NP4/P2Pp3/PKP2p2/p2pkp2/R3nn2/4R1B1

#2

11 + 9

1577 Jaarboek 1933
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d2
      • 2.Rxa3#
    • 1...e4
      • 2.Qa7#
  • Tries
    • 1.Kxa3?
      • 1...e4
        • 2.Qa7#
      • 1...d2!
    • 1.Kb3?
      • 1...e4
        • 2.Qa7#
      • 1...d2!
    • 1.Kc5?
      • 1...d2
        • 2.Rxa3#
      • 1...e4!
    • 1.Sxe5?
      • threat
        • 2.Qxd3#
      • 1...d2
        • 2.Qd3#
      • 1...Kd4!
    • 1.Se7?
      • 1...Kd4
        • 2.Bxf2#
      • 1...e4
        • 2.Sf5#
      • 1...d2!
    • 1.Sb8?
      • 1...Kd4
        • 2.Bxf2#
      • 1...e4
        • 2.Qa7#
      • 1...d2!
    • 1.Sd8?
      • 1...Kd4
        • 2.Bxf2#
      • 1...e4
        • 2.Qa7#
      • 1...d2!
    • 1.Qf5?
      • threat
        • 2.Qxe5#
      • 1...d2
        • 2.Rxa3#
      • 1...e4!
    • 1.Qg6?
      • 1...d2
        • 2.Rxa3#
      • 1...e4!
    • 1.Qe7?
      • threat
        • 2.Qxe5#
      • 1...Ke4
        • 2.Qxe5#
      • 1...e4
        • 2.Qa7#
      • 1...d2!
    • 1.Qg7?
      • threat
        • 2.Qxe5#
      • 1...Ke4
        • 2.Qxe5#
      • 1...e4
        • 2.Qd4#
        • 2.Qa7#
      • 1...d2!
    • 1.Qh8?
      • threat
        • 2.Qxe5#
      • 1...Ke4
        • 2.Qxe5#
      • 1...e4
        • 2.Qd4#
      • 1...d2!
    • 1.c5?
      • 1...d2
        • 2.Rxa3#
      • 1...e4!
    • 1.d7?
      • 1...d2
        • 2.Rxa3#
      • 1...e4!
  • Keys
    • 1.Sd4!
      • 1...Kxd4
        • 2.Bxf2#
      • 1...exd4
        • 2.Qe7#
      • 1...d2
        • 2.Sc2#
      • 1...e4
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(d);OGATEB,SBLOCK::R(C),XP(c)
    • P(h);SBLOCK::QAB(K)
  • Tries
    • Try
      • K(E);S_FLIGHT,XP(c)
      • Vars
        • P(h);SBLOCK::QAB(K)
      • Refutation
        • P(d);
    • Try
      • K(E);P-FLIGHT
      • Vars
        • P(h);SBLOCK::QAB(K)
      • Refutation
        • P(d);
    • Try
      • K(E);S_FLIGHT
      • Vars
        • P(d);OGATEB,SBLOCK::R(C),XP(c)
      • Refutation
        • P(h);
    • Try
      • S(I);XP(h)
      • Threat
        • QAR1(K),XP(d)
      • Vars
        • P(d);::QAR1(K)
      • Refutation
        • K(e);N_SPINS(a),P_SPINS(b),S_FLIGHT
    • Try
      • S(I);
      • Vars
        • K(e);N_SPINS(a),P_SPINS(b),S_FLIGHT::B(B),XS(b)
        • P(h);SBLOCK::S(I)
      • Refutation
        • P(d);
    • Try
      • S(I);
      • Vars
        • K(e);N_SPINS(a),P_SPINS(b),S_FLIGHT::B(B),XS(b)
        • P(h);SBLOCK::QAB(K)
      • Refutation
        • P(d);
    • Try
      • S(I);
      • Vars
        • K(e);N_SPINS(a),P_SPINS(b),S_FLIGHT::B(B),XS(b)
        • P(h);SBLOCK::QAB(K)
      • Refutation
        • P(d);
    • Try
      • Q(K);
      • Threat
        • QAR2(K),XP(h)
      • Vars
        • P(d);OGATEB,SBLOCK::R(C),XP(c)
      • Refutation
        • P(h);
    • Try
      • Q(K);
      • Vars
        • P(d);OGATEB,SBLOCK::R(C),XP(c)
      • Refutation
        • P(h);
    • Try
      • Q(K);P_PINP(h)
      • Threat
        • QAR2(K),XP(h)
      • Vars
        • K(e);P-FLIGHT::QAR1(K),XP(h)
        • P(h);SBLOCK::QAB(K)
      • Refutation
        • P(d);
    • Try
      • Q(K);
      • Threat
        • QAR2(K),XP(h)
      • Vars
        • K(e);P-FLIGHT::QAR1(K),XP(h)
      • Refutation
        • P(d);
    • Try
      • Q(K);
      • Threat
        • QAR2(K),XP(h)
      • Vars
        • K(e);P-FLIGHT::QAR1(K),XP(h)
        • P(h);OGATE::QAB1(K)
      • Refutation
        • P(d);
    • Try
      • P(F);
      • Vars
        • P(d);OGATEB,SBLOCK::R(C),XP(c)
      • Refutation
        • P(h);
    • Try
      • P(J);
      • Vars
        • P(d);OGATEB,SBLOCK::R(C),XP(c)
      • Refutation
        • P(h);
  • Actual
    • S(I);
    • Vars
      • K(e);N_SPINS(a),P_SPINS(b),S_FLIGHT,XS(I)::B(B),XS(b)
      • P(h);OGATEB,SBLOCK,XS(I)::QAR(K)
      • P(d);N_GUARD,SBLOCK::S(I)
      • P(h);SBLOCK::S(I)
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