MESON Chess Problem Database

Problem Display
PID: 187458 (1n5K/2B1Q2p/7r/pp1kN2p/8/1Np1pP2/B3r3/b7 w - - 0 1)

Evans, TC

The Observer, 1935

(First published on Sun Jul 14 1935)

1n5K/2B1Q2p/7r/pp1kN2p/8/1Np1pP2/B3r3/b7

#2

7 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Qxd6#
    • 1...Re6
      • 2.Qc5#
  • Tries
    • 1.Sc1+?
      • 1...Kd4
        • 2.Sxe2#
      • 1...Rxa2!
    • 1.Sxa5+?
      • 1...Kd4
        • 2.Qb4#
      • 1...Rxa2!
    • 1.Sd3?
      • threat
        • 2.Qe4#
      • 1...Kc4
        • 2.Qe4#
      • 1...Kc6
        • 2.Sxa5#
      • 1...Re6
        • 2.Qc5#
      • 1...c2+!
    • 1.Sg4?
      • threat
        • 2.Qe4#
      • 1...Kc4
        • 2.Qe4#
      • 1...Kc6
        • 2.Sxa5#
      • 1...Re6
        • 2.Qc5#
      • 1...c2+!
    • 1.Sf7?
      • threat
        • 2.Qe4#
      • 1...Kc4
        • 2.Qe4#
      • 1...Kc6
        • 2.Sxa5#
      • 1...Re6
        • 2.Qc5#
      • 1...c2+!
    • 1.Qd8+?
      • 1...Ke6
        • 2.Sd4#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Sd7!
    • 1.Qd7+?
      • 1...Rd6
        • 2.Qxd6#
      • 1...Sxd7!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Qe4#
      • 1...c2+
        • 2.Sbd4#
      • 1...Kc4
        • 2.Qe4#
      • 1...Kxc6
        • 2.Sxa5#
      • 1...Re6
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(i);N_GUARD::QAR1(F),XR(i)
    • R(i);SBLOCK::QAR1(F)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(g);P-FLIGHT::S(B),XR(b)
      • Refutation
        • R(b);XB(A)
    • Try
      • S(B);CHECK,XP(e)
      • Vars
        • K(g);P-FLIGHT::QAR2(F)
      • Refutation
        • R(b);XB(A)
    • Try
      • S(D);
      • Threat
        • QAB1(F)
      • Vars
        • K(g);S_FLIGHT::QAR2(F)
        • K(g);S_FLIGHT::S(B),XP(e)
        • R(i);SBLOCK::QAR1(F)
      • Refutation
        • P(c);CHECK
    • Try
      • S(D);
      • Threat
        • QAB1(F)
      • Vars
        • K(g);S_FLIGHT::QAR2(F)
        • K(g);S_FLIGHT::S(B),XP(e)
        • R(i);SBLOCK::QAR1(F)
      • Refutation
        • P(c);CHECK
    • Try
      • S(D);
      • Threat
        • QAB1(F)
      • Vars
        • K(g);S_FLIGHT::QAR2(F)
        • K(g);S_FLIGHT::S(B),XP(e)
        • R(i);SBLOCK::QAR1(F)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(F);CHECK
      • Vars
        • K(g);S_FLIGHT::B(A)+S(B),DCHECK
        • R(i);N_GUARD,P_SPINR(i)::QAR1(F),XR(i)
      • Refutation
        • S(k);P_SPINS(k)
    • Try
      • Q(F);CHECK
      • Vars
        • R(i);N_GUARD,P_SPINR(i)::QAR1(F),XR(i)
      • Refutation
        • S(k);XQ(F)
  • Actual
    • S(D);
    • Threat
      • QAB1(F)
    • Vars
      • P(c);CHECK,S_CUTR(b)::B(A)+S(B)
      • K(g);S_FLIGHT::QAR2(F)
      • K(g);S_FLIGHT,XS(D)::S(B),XP(e)
      • R(i);SBLOCK::QAR1(F)
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