MESON Chess Problem Database

Problem Display
PID: 199571 (3N4/2p2p2/1nPB1p2/Q1Nk4/2n1R2K/7R/B7/3r4 w - - 0 1)

Byas, Walter

The Observer, 1946

(First published on Sun Jan 27 1946)

3N4/2p2p2/1nPB1p2/Q1Nk4/2n1R2K/7R/B7/3r4

#2

9 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd6
      • 2.Scb7#
    • 1...Ra1
      • 2.Rd3#
      • 2.Qd2#
    • 1...Rb1
      • 2.Rd3#
      • 2.Qd2#
    • 1...Rc1
      • 2.Rd3#
      • 2.Qd2#
    • 1...Re1
      • 2.Rd3#
      • 2.Qd2#
    • 1...Rf1
      • 2.Rd3#
      • 2.Qd2#
    • 1...Rg1
      • 2.Rd3#
      • 2.Qd2#
    • 1...Rh1
      • 2.Qd2#
    • 1...Rd2
      • 2.Qxd2#
    • 1...Rd3
      • 2.Rxd3#
  • Tries
    • 1.Sd3+?
      • 1...Kxd6
        • 2.Qc5#
      • 1...Kxe4!
    • 1.Sa4+?
      • 1...Kxd6
        • 2.Qc5#
      • 1...Kxe4!
    • 1.Sa6+?
      • 1...Kxd6
        • 2.Qc5#
      • 1...Kxe4!
    • 1.Sce6+?
      • 1...Kxd6
        • 2.Qc5#
      • 1...Kxe4!
    • 1.Sd7+?
      • 1...Kxd6
        • 2.Qc5#
      • 1...Kxe4!
    • 1.Bxc4+?
      • 1...Kxd6
        • 2.Scb7#
      • 1...Sxc4!
    • 1.Re5+?
      • 1...Kd4
        • 2.Sb3#
        • 2.Qc3#
      • 1...Kxd6
        • 2.Se4#
        • 2.Scb7#
      • 1...fxe5!
  • Keys
    • 1.Re1!
      • threat
        • 2.Rxd1#
      • 1...Rd4+
        • 2.Se4#
      • 1...Kd4
        • 2.Sb3#
      • 1...Kxd6
        • 2.Scb7#
      • 1...Rxe1
        • 2.Rd3#
        • 2.Qd2#
      • 1...cxd6
        • 2.Sce6#
      • 1...Ra1
        • 2.Rd3#
        • 2.Qd2#
      • 1...Rb1
        • 2.Rd3#
        • 2.Qd2#
      • 1...Rc1
        • 2.Rd3#
        • 2.Qd2#
      • 1...Rd2
        • 2.Qxd2#
      • 1...Rd3
        • 2.Rxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(c);N_SPINS(b),P-FLIGHT,XB(H)::S(F)
    • R(a);N_GUARD,P_PINR(B)::QAR(E)
    • R(a);N_GUARD::QAR(E),XR(a)
    • R(a);N_GUARD::R(B),XR(a)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_SPINS(b),P-FLIGHT,XB(H)::QAB1(E)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XR(C)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_SPINS(b),P-FLIGHT,XB(H)::QAB1(E)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XR(C)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_SPINS(b),P-FLIGHT,XB(H)::QAB1(E)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XR(C)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_SPINS(b),P-FLIGHT,XB(H)::QAB1(E)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XR(C)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_SPINS(b),P-FLIGHT,XB(H)::QAB1(E)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XR(C)
    • Try
      • B(A);CHECK,XS(b)
      • Vars
        • K(c);P-FLIGHT,XB(H)::S(F)
      • Refutation
        • S(d);XB(A)
    • Try
      • R(C);CHECK
      • Refutation
        • P(e);XR(C)
  • Actual
    • R(C);
    • Threat
      • R(C),XR(a)
    • Vars
      • R(a);CHECK,SBLOCK::QAR(E)+S(F)
      • K(c);N_SPINS(b),P-FLIGHT::S(F)
      • K(c);N_SPINS(b),P-FLIGHT,XB(H)::S(F)
      • P(f);SBLOCK,XB(H)::QAR(E)+S(F)
      • R(a);N_GUARD::QAR(E),XR(a)
      • R(a);N_GUARD::R(B),XR(a)
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