MESON Chess Problem Database

Problem Display
PID: 272643 (8/4p3/p3Pp2/1p3K2/1P1k1NQ1/N1pBp3/3r4/8 w - - 0 1)

Hanson, JH

Sunday Referee, 1934

(First published on Sun Nov 11 1934)

8/4p3/p3Pp2/1p3K2/1P1k1NQ1/N1pBp3/3r4/8

#2

7 + 8

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Sc2#
    • 1...Rc2
      • 2.Sxc2#
    • 1...e2
      • 2.Qg1#
    • 1...a5
      • 2.Sxb5#
  • Tries
    • 1.Se2+?
      • 1...Kxd3
        • 2.Sc1#
      • 1...Kd5!
    • 1.Sg2+?
      • 1...Kxd3
        • 2.Se1#
      • 1...Kd5!
    • 1.Qf3?
      • threat
        • 2.Qe4#
        • 2.Qd5#
      • 1...e2
        • 2.Qe4#
        • 2.Qf2#
      • 1...c2!
    • 1.Qg8?
      • threat
        • 2.Qd8#
      • 1...e2
        • 2.Qg1#
      • 1...c2!
  • Keys
    • 1.Qd1!
      • 1...Rxd1
        • 2.Sc2#
      • 1...Rxd3
        • 2.Qxd3#
      • 1...c2
        • 2.Qa1#
      • 1...e2
        • 2.Qg1#
      • 1...Ra2
        • 2.Bc2#
      • 1...Rb2
        • 2.Bc2#
      • 1...Rc2
        • 2.Sxc2#
        • 2.Bxc2#
      • 1...Re2
        • 2.Bxe2#
      • 1...Rf2
        • 2.Be2#
      • 1...Rg2
        • 2.Be2#
      • 1...Rh2
        • 2.Be2#
      • 1...a5
        • 2.Sxb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD::S(A)
    • R(a);N_GUARD::S(A),XR(a)
    • P(c);OGATEB::QAB(E)
    • P(f);N_GUARD::S(A),XP(e)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT,XB(B)::S(D)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT,XB(B)::S(D)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
    • Try
      • Q(E);
      • Threat
        • QAR(E)
      • Vars
        • P(c);OGATEB::QAB(E)
      • Refutation
        • P(b);
  • Actual
    • Q(E);
    • Vars
      • R(a);N_GUARD,XQ(E)::S(A)
      • R(a);OGATE,P_SPINR(a),XB(B)::QAR1(E),XR(a)
      • P(b);OGATEB::QAB(E)
      • P(c);OGATEB::QAB(E)
      • R(a);OGATEB::QAR(E)+B(B)
      • R(a);OGATEB::QAR(E)+B(B),XR(a)
      • R(a);OGATEB,P_PINS(D)::QAR(E)+B(B)
      • P(f);N_GUARD::S(A),XP(e)
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