MESON Chess Problem Database

Problem Display
PID: 200250 (8/3p4/3K4/7n/5nR1/5k1P/8/2N1Q3 w - - 0 1)

Beal, Edward W

The Problemist, 1982

8/3p4/3K4/7n/5nR1/5k1P/8/2N1Q3

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Qxe2#
    • 1...Sg2
      • 2.Qe2#
    • 1...Sd3
      • 2.Qe2#
    • 1...Sxh3
      • 2.Qe2#
    • 1...Sd5
      • 2.Qe2#
    • 1...Se6
      • 2.Qe2#
    • 1...Sg6
      • 2.Qe2#
    • 1...Sg3
      • 2.Rxg3#
    • 1...Sf6
      • 2.Rg3#
    • 1...Sg7
      • 2.Rg3#
  • Tries
    • 1.Kxd7?
      • 1...Sxh3
        • 2.Qe2#
      • 1...Se2
        • 2.Qxe2#
      • 1...Sg3
        • 2.Rxg3#
      • 1...Sg2
        • 2.Qe2#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sd5
        • 2.Qe2#
      • 1...Se6
        • 2.Qe2#
      • 1...Sg6
        • 2.Qe2#
      • 1...Sg7
        • 2.Rg3#
      • 1...Sf6+!
    • 1.Sd3?
      • threat
        • 2.Se5#
      • 1...Se2
        • 2.Qf2#
      • 1...Sg3
        • 2.Rxg3#
      • 1...Sg6
        • 2.Qf2#
        • 2.Qe4#
      • 1...Sxd3!
    • 1.Qg3+?
      • 1...Ke4
        • 2.Qd3#
      • 1...Sxg3!
    • 1.Qf1+?
      • 1...Ke4
        • 2.Qd3#
      • 1...Ke3!
    • 1.h4?
      • 1...Se2
        • 2.Qxe2#
      • 1...Sg3
        • 2.Rxg3#
      • 1...Sg2
        • 2.Qe2#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sh3
        • 2.Qe2#
      • 1...Sd5
        • 2.Qe2#
      • 1...Se6
        • 2.Qe2#
      • 1...Sg6
        • 2.Qe2#
      • 1...Sf6
        • 2.Rg3#
      • 1...Sg7
        • 2.Rg3#
      • 1...Kxg4!
  • Keys
    • 1.Qd2!
      • 1...Ke4
        • 2.Qd3#
      • 1...Sxh3
        • 2.Qe2#
      • 1...Se2
        • 2.Qxe2#
      • 1...Sg2
        • 2.Qe2#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sd5
        • 2.Qe2#
      • 1...Se6
        • 2.Qe2#
      • 1...Sg6
        • 2.Qe2#
      • 1...Sg3
        • 2.Rxf4#
      • 1...Sf6
        • 2.Qxf4#
      • 1...Sg7
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB1(B),XS(b)
    • S(b);N_GUARD::QAB1(B)
    • S(b);N_GUARD,XP(C)::QAB1(B)
    • S(c);N_GUARD::R1(D),XS(c)
    • S(c);N_GUARD::R1(D)
  • Tries
    • Try
      • K(E);P-FLIGHT,XP(d)
      • Vars
        • S(b);N_GUARD,XP(C)::QAB1(B)
        • S(b);N_GUARD::QAB1(B),XS(b)
        • S(c);N_GUARD::R1(D),XS(c)
        • S(b);N_GUARD::QAB1(B)
        • S(c);N_GUARD::R1(D)
      • Refutation
        • S(c);CHECK
    • Try
      • S(A);
      • Threat
        • S(A)
      • Vars
        • S(b);::QAR1(B)
        • S(c);N_GUARD::R1(D),XS(c)
      • Refutation
        • S(b);XS(A)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P_SPINS(b),S_FLIGHT::QAB1(B)
      • Refutation
        • S(c);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(C);
      • Vars
        • S(b);N_GUARD::QAB1(B),XS(b)
        • S(c);N_GUARD::R1(D),XS(c)
        • S(b);N_GUARD::QAB1(B)
        • S(c);N_GUARD::R1(D)
      • Refutation
        • K(a);S_FLIGHT,XR(D)
  • Actual
    • Q(B);
    • Vars
      • K(a);P_SPINS(b),S_FLIGHT::QAB1(B)
      • S(b);N_GUARD,XP(C)::QAB1(B)
      • S(b);N_GUARD::QAB1(B),XS(b)
      • S(b);N_GUARD::QAB1(B)
      • S(c);N_GUARD,SBLOCK::R1(D),XS(b)
      • S(c);N_GUARD::QAR1(B),XS(b)
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