MESON Chess Problem Database

Problem Display
PID: 199688 (2rr4/7p/n3N2K/b2kP1Rn/1p1Np3/1P6/8/3R1Q2 w - - 0 1)

Dale, John

The Observer, 1946

(First published on Sun May 26 1946)

2rr4/7p/n3N2K/b2kP1Rn/1p1Np3/1P6/8/3R1Q2

#2

8 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Qxc4#
      • 2.bxc4#
    • 1...Ra8
      • 2.Qc4#
    • 1...Rb8
      • 2.Qc4#
    • 1...Bc7
      • 2.Qc4#
    • 1...Sc5
      • 2.Qc4#
    • 1...Sc7
      • 2.Qc4#
    • 1...e3
      • 2.Qg2#
      • 2.Qh1#
      • 2.Qf3#
  • Tries
    • 1.Sc6+?
      • 1...Kxe6
        • 2.Qf5#
      • 1...Kxc6!
    • 1.Sf4+?
      • 1...Kc5
        • 2.Qb5#
      • 1...Sxf4!
    • 1.Sc7+?
      • 1...Kc5
        • 2.Qb5#
      • 1...Bxc7
        • 2.Qc4#
      • 1...Sxc7
        • 2.Qc4#
      • 1...Rxc7!
    • 1.Qb5+?
      • 1...Sc5
        • 2.Qc4#
      • 1...Rc5!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Qc4#
      • 1...Rc6+
        • 2.Sde6#
      • 1...Rd6+
        • 2.e6#
      • 1...Kxc5
        • 2.Qb5#
      • 1...Rxc5
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(h);N_GUARD::QAB1(B)
    • B(c);S_CUTR(h)::QAB1(B)
    • S(f);S_CUTR(h)::QAB1(B)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(d);S_FLIGHT,XS(G)::QAB1(B)
      • Refutation
        • K(d);S_FLIGHT,XS(D)
    • Try
      • S(G);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • S(e);XS(G)
    • Try
      • S(G);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
        • B(c);XS(G)::QAB1(B)
        • S(f);XS(G)::QAB1(B)
      • Refutation
        • R(h);XS(G)
    • Try
      • Q(B);CHECK
      • Vars
        • S(f);P_SPINS(f),S_CUTR(h)::QAB1(B)
      • Refutation
        • R(h);P_SPINR(h)
  • Actual
    • S(G);
    • Threat
      • QAB1(B)
    • Vars
      • R(h);CHECK,SBLOCK::R(A)+S(D)
      • R(i);CHECK,SBLOCK::R(F)+P(E)
      • K(d);OGATEB,P-FLIGHT,XS(G)::QAR1(B)
      • R(h);SBLOCK,XS(G)::QAB(B)
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