MESON Chess Problem Database

Problem Display
PID: 150021 (8/8/8/2pp4/5Q2/2pk2N1/R7/K1B5 w - - 0 1)

Akerblom, Johan Axel

Il Problema, 1970

8/8/8/2pp4/5Q2/2pk2N1/R7/K1B5

#2

5 + 4

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...c2
      • 2.Ra3#
    • 1...c4
      • 2.Qe3#
    • 1...d4
      • 2.Qf1#
  • Tries
    • 1.Kb1?
      • 1...d4
        • 2.Qf1#
      • 1...c4
        • 2.Qe3#
      • 1...c2+!
    • 1.Bd2?
      • 1...d4
        • 2.Qf1#
      • 1...c2
        • 2.Ra3#
      • 1...c4
        • 2.Qe3#
      • 1...cxd2!
    • 1.Be3?
      • 1...c2
        • 2.Ra3#
      • 1...c4
        • 2.Qd4#
      • 1...d4!
    • 1.Rb2?
      • 1...c2
        • 2.Rb3#
      • 1...d4
        • 2.Qf1#
      • 1...c4
        • 2.Qe3#
      • 1...cxb2+!
    • 1.Re2?
      • 1...c2
        • 2.Re3#
      • 1...c4
        • 2.Qe3#
      • 1...d4!
    • 1.Rf2?
      • 1...c2
        • 2.Rf3#
      • 1...c4
        • 2.Qe3#
      • 1...d4!
    • 1.Rg2?
      • 1...d4
        • 2.Qf1#
      • 1...c4
        • 2.Qe3#
      • 1...c2!
    • 1.Rh2?
      • 1...d4
        • 2.Qf1#
      • 1...c4
        • 2.Qe3#
      • 1...c2!
    • 1.Qa4?
      • 1...c2
        • 2.Ra3#
      • 1...c4
        • 2.Qd1#
      • 1...d4!
  • Keys
    • 1.Qg4!
      • 1...c2
        • 2.Ra3#
      • 1...d4
        • 2.Qe2#
      • 1...c4
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB,SBLOCK::R(C)
    • P(c);SBLOCK::QAR1(E)
    • P(d);SBLOCK::QAB(E)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(d);SBLOCK::QAB(E)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(a);CHECK
    • Try
      • B(B);
      • Vars
        • P(d);SBLOCK::QAB(E)
        • P(a);OGATEB,SBLOCK::R(C)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(a);XB(B)
    • Try
      • B(B);
      • Vars
        • P(a);OGATEB,SBLOCK::R(C)
        • P(c);N_GUARD::QAR1(E)
      • Refutation
        • P(d);
    • Try
      • R(C);
      • Vars
        • P(a);OGATEB,SBLOCK::R(C)
        • P(d);SBLOCK::QAB(E)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(a);CHECK,XR(C)
    • Try
      • R(C);
      • Vars
        • P(a);SBLOCK::R1(C)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(d);
    • Try
      • R(C);
      • Vars
        • P(a);SBLOCK::R(C)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(d);
    • Try
      • R(C);
      • Vars
        • P(d);SBLOCK::QAB(E)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(a);
    • Try
      • R(C);
      • Vars
        • P(d);SBLOCK::QAB(E)
        • P(c);SBLOCK::QAR1(E)
      • Refutation
        • P(a);
    • Try
      • Q(E);
      • Vars
        • P(a);OGATEB::R(C)
        • P(c);SBLOCK::QAR2(E)
      • Refutation
        • P(d);
  • Actual
    • Q(E);
    • Vars
      • P(a);OGATEB,SBLOCK::R(C)
      • P(d);SBLOCK::QAB1(E)
      • P(c);SBLOCK::QAR2(E)
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