MESON Chess Problem Database

Problem Display
PID: 195937 (8/8/8/1p1K2p1/1B1NP1Pp/nB1k4/p3p1N1/rn2Qb2 w - - 0 1)

Gunn, Robert Ivan

The Observer, 1942

(First published on Sun Oct 18 1942)

8/8/8/1p1K2p1/1B1NP1Pp/nB1k4/p3p1N1/rn2Qb2

#2

8 + 10

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg2
      • 2.Qxe2#
    • 1...Sd2
      • 2.Qxd2#
    • 1...Sc3+
      • 2.Qxc3#
    • 1...Sc2
      • 2.Bxc2#
    • 1...Sc4
      • 2.Bc2#
    • 1...h3
      • 2.Qg3#
  • Tries
    • 1.Se6?
      • threat
        • 2.Sc5#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Bxg2!
    • 1.Ba4?
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Bxg2
        • 2.Qxe2#
      • 1...Sc2
        • 2.Bxc2#
        • 2.Bxb5#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sc4
        • 2.Bc2#
      • 1...h3
        • 2.Qg3#
      • 1...bxa4!
    • 1.Ba5?
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Bxg2
        • 2.Qxe2#
      • 1...Sc2
        • 2.Bxc2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sc4
        • 2.Bc2#
      • 1...h3
        • 2.Qg3#
      • 1...b4!
    • 1.Qf2?
      • threat
        • 2.Se1#
        • 2.Qe3#
        • 2.Qf3#
      • 1...Bxg2
        • 2.Qxe2#
      • 1...e1Q
        • 2.Sxe1#
      • 1...e1S
        • 2.Sxe1#
        • 2.Qe3#
        • 2.Qxf1#
      • 1...e1B
        • 2.Sxe1#
        • 2.Qe3#
        • 2.Qxf1#
        • 2.Qf3#
      • 1...e1R
        • 2.Sxe1#
      • 1...Sc2
        • 2.Bxc2#
      • 1...Sd2
        • 2.Qe3#
      • 1...Sc4
        • 2.Se1#
        • 2.Bc2#
      • 1...Sc3+!
    • 1.Qc1?
      • threat
        • 2.Se1#
        • 2.Qe3#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...e1Q
        • 2.Sxe1#
      • 1...e1S
        • 2.Sxe1#
        • 2.Qe3#
      • 1...e1B
        • 2.Sxe1#
        • 2.Qe3#
      • 1...e1R
        • 2.Sxe1#
      • 1...Sc2
        • 2.Bxc2#
        • 2.Qxc2#
      • 1...Sd2
        • 2.Qxd2#
        • 2.Qc3#
      • 1...Sc4
        • 2.Se1#
        • 2.Bc2#
        • 2.Qc2#
      • 1...Bxg2!
    • 1.e5?
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Sc2
        • 2.Bxc2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sc4
        • 2.Bc2#
      • 1...h3
        • 2.Qg3#
      • 1...Bxg2+!
  • Keys
    • 1.Bd1!
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Bxg2
        • 2.Qxe2#
      • 1...exd1Q
        • 2.Qe3#
      • 1...exd1S
        • 2.Qxf1#
      • 1...exd1B
        • 2.Qe3#
      • 1...exd1R
        • 2.Qe3#
      • 1...Sc2
        • 2.Bxc2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sc4
        • 2.Bc2#
      • 1...h3
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD,P_PINP(F),XS(B)::QAB1(A),XP(e)
    • S(b);N_GUARD::QAR1(A),XS(b)
    • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
    • S(f);N_GUARD::B(C),XS(f)
    • S(f);N_GUARD::B(C)
    • P(h);N_GUARD::QAR(A)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
      • Refutation
        • B(c);P_PINP(F),XS(B)
    • Try
      • B(C);
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
        • B(c);N_GUARD,P_PINP(F),XS(B)::QAB1(A),XP(e)
        • S(b);N_GUARD::QAR1(A),XS(b)
        • S(f);N_GUARD::B(C)
        • P(h);N_GUARD::QAR(A)
      • Refutation
        • P(i);XB(C)
    • Try
      • B(D);
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
        • B(c);N_GUARD,P_PINP(F),XS(B)::QAB1(A),XP(e)
        • S(f);N_GUARD::B(C),XS(f)
        • S(b);N_GUARD::QAR1(A),XS(b)
        • S(f);N_GUARD::B(C)
        • P(h);N_GUARD::QAR(A)
      • Refutation
        • P(i);
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • B(c);N_GUARD,P_PINP(F),XS(B)::QAB1(A),XP(e)
        • P(e);::S(B),XQ(e)
        • P(e);::S(B),XR(e)
        • S(f);N_GUARD::B(C),XS(f)
        • S(b);::QAR1(A)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
        • P(e);::S(B),XQ(e)
        • P(e);::S(B),XR(e)
      • Refutation
        • B(c);P_PINP(F),XS(B)
    • Try
      • P(F);
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
        • S(f);N_GUARD::B(C),XS(f)
        • S(b);N_GUARD::QAR1(A),XS(b)
        • S(f);N_GUARD::B(C)
        • P(h);N_GUARD::QAR(A)
      • Refutation
        • B(c);CHECK,XS(B)
  • Actual
    • B(C);
    • Vars
      • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
      • B(c);N_GUARD,P_PINP(F),XS(B)::QAB1(A),XP(e)
      • P(e);OGATE,XB(C)::QAR1(A)
      • P(e);OGATEB,XB(C)::QAB(A),XB(c)
      • S(f);N_GUARD::B(C),XS(f)
      • S(b);N_GUARD::QAR1(A),XS(b)
      • S(f);N_GUARD::B(C)
      • P(h);N_GUARD::QAR(A)
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