MESON Chess Problem Database

Problem Display
PID: 149566 (8/1p3p2/kP1R1Pp1/b5K1/Qp6/8/8/8 w - - 0 1)

Dawson, Thomas Rayner

Pittsburgh Sun, 1922

(First published on Sat Jan 21 1922)

8/1p3p2/kP1R1Pp1/b5K1/Qp6/8/8/8

#2

5 + 6

15256 TRD Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.Qc4#
  • Tries
    • 1.Kf4?
      • 1...b3
        • 2.Qc4#
      • 1...g5+!
    • 1.Kg4?
      • 1...b3
        • 2.Qc4#
      • 1...g5!
    • 1.Kh4?
      • 1...b3
        • 2.Qc4#
      • 1...g5+!
    • 1.Kh6?
      • 1...b3
        • 2.Qc4#
      • 1...g5!
    • 1.Rc6?
      • 1...b3
        • 2.Qc4#
      • 1...bxc6!
    • 1.Re6?
      • 1...b3
        • 2.Qc4#
      • 1...fxe6!
    • 1.Qd1?
      • threat
        • 2.Qe2#
        • 2.Qf1#
        • 2.Qd3#
      • 1...Bxb6
        • 2.Qa4#
      • 1...Kb5!
    • 1.Qc2?
      • threat
        • 2.Qd3#
        • 2.Qe2#
        • 2.Qc4#
      • 1...Bxb6
        • 2.Qa4#
      • 1...Kb5!
    • 1.Qb3?
      • threat
        • 2.Qc4#
        • 2.Qd3#
      • 1...Bxb6
        • 2.Qa4#
      • 1...Kb5!
    • 1.Qc6?
      • threat
        • 2.Qc4#
      • 1...Bxb6
        • 2.Qa4#
        • 2.Qxb6#
      • 1...bxc6!
    • 1.Qd7?
      • 1...Bxb6
        • 2.Qa4#
      • 1...b3!
    • 1.Qa2?
      • threat
        • 2.Qc4#
        • 2.Qe2#
      • 1...b3
        • 2.Qe2#
      • 1...Kb5!
    • 1.Qxb4?
      • threat
        • 2.Qc4#
      • 1...Bxb6
        • 2.Qa4#
        • 2.Qxb6#
      • 1...Bxb4!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qe2#
      • 1...Bxb6
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATE::QAB(A)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(d);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(d);
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(d);CHECK
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(d);
    • Try
      • R(D);
      • Vars
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(e);XR(D)
    • Try
      • R(D);
      • Vars
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(f);XR(D)
    • Try
      • Q(A);N_PINB(b)
      • Threat
        • DUALS(3)
      • Vars
        • B(b);OGATEB,P_SPINB(b),XP(C)::QAR2(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);N_PINB(b)
      • Threat
        • DUALS(3)
      • Vars
        • B(b);OGATEB,P_SPINB(b),XP(C)::QAR2(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);N_PINB(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);OGATEB,P_SPINB(b),XP(C)::QAR2(A)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • Q(A);N_PINB(b)
      • Threat
        • QAB(A)
      • Refutation
        • P(e);XQ(A)
    • Try
      • Q(A);N_PINB(b)
      • Vars
        • B(b);OGATEB,P_SPINB(b),XP(C)::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAB(A)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT
    • Try
      • Q(A);N_PINB(b),XP(a)
      • Threat
        • QAB(A)
      • Refutation
        • B(b);XQ(A)
  • Actual
    • Q(A);N_PINB(b)
    • Threat
      • QAB(A)
    • Vars
      • B(b);OGATEB,P_SPINB(b),XP(C)::QAR2(A)
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