MESON Chess Problem Database

Problem Display
PID: 46641 (4R3/7p/3pN1p1/1B4p1/2pBk3/b1r2NK1/1n4Q1/4r3 w - - 0 1)

Eddy, Edwin John

1st Prize, The Observer, 1962

4R3/7p/3pN1p1/1B4p1/2pBk3/b1r2NK1/1n4Q1/4r3

#2

7 + 10

56 The Problemist 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Sxe1#
    • 1...Kd5
      • 2.Sc7#
    • 1...Kf5
      • 2.Sg7#
    • 1...Rxf3+
      • 2.Qxf3#
    • 1...Sd3
      • 2.Sh4#
  • Tries
    • 1.Kg4?
      • threat
        • 2.Sf4#
      • 1...Kd3
        • 2.Sxe1#
      • 1...Kd5
        • 2.Sc7#
      • 1...Rxf3
        • 2.Qxf3#
      • 1...Sd3
        • 2.Sxe1#
        • 2.Sg1#
        • 2.Sd2#
        • 2.Sh2#
        • 2.Sh4#
        • 2.Se5#
        • 2.Sfxg5#
      • 1...d5
        • 2.Sc5#
      • 1...h5+!
    • 1.Sc5+?
      • 1...Kf5
        • 2.Rf8#
      • 1...Kd5!
    • 1.Sxg5+?
      • 1...Kd3
        • 2.Qd2#
      • 1...Kf5
        • 2.Rf8#
        • 2.Qh3#
      • 1...Kd5!
    • 1.Sc7+?
      • 1...Kd3
        • 2.Qd2#
      • 1...Kf5!
    • 1.Sg7+?
      • 1...Kd3
        • 2.Qd2#
      • 1...Kd5!
    • 1.Sd8+?
      • 1...Kd3
        • 2.Qd2#
      • 1...Kd5
        • 2.Bc6#
      • 1...Kf5!
    • 1.Bc6+?
      • 1...Kd3
        • 2.Sxe1#
        • 2.Qd2#
      • 1...Kf5
        • 2.Sg7#
      • 1...d5!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Sf4#
      • 1...Rxf3+
        • 2.Qxf3#
      • 1...Kd3
        • 2.Sxe1#
      • 1...Kd5
        • 2.Sc7#
      • 1...Kf5
        • 2.Sg7#
      • 1...Sd3
        • 2.Sh4#
      • 1...d5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(f);N_PINS(B),P_SPINP(e),S_FLIGHT::S(B),XR(a)
    • K(f);S_FLIGHT::S(F)
    • R(d);CHECK,OGATE,P_SPINR(d),XS(B)::QAB1(A),XR(d)
    • S(b);N_PINS(B),SBLOCK::QAB(A)+S(B)
  • Tries
    • Try
      • K(C);N_SPINS(B),P-FLIGHT
      • Threat
        • R(G)+S(F)
      • Vars
        • K(f);P_SPINP(e),S_FLIGHT::S(B),XR(a)
        • K(f);S_FLIGHT::S(F)
        • R(d);OGATE,P_SPINR(d),XS(B)::QAB1(A),XR(d)
        • P(h);SBLOCK::R(G)+S(F),DCHECK
      • Refutation
        • P(j);CHECK
    • Try
      • S(F);CHECK
      • Vars
        • K(f);S_FLIGHT::R(G)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK,XP(g)
      • Vars
        • K(f);N_PINS(B),P_SPINP(e),S_FLIGHT::QAR1(A)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_PINS(B),P_SPINP(e),S_FLIGHT::QAR1(A)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_PINS(B),P_SPINP(e),S_FLIGHT::QAR1(A)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_PINS(B),P_SPINP(e),S_FLIGHT::QAR1(A)
        • K(f);S_FLIGHT::B(E)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • B(E);CHECK
      • Vars
        • K(f);S_FLIGHT::S(F)
      • Refutation
        • P(h);P_SPINP(h)
  • Actual
    • B(E);
    • Threat
      • R(G)+S(F)
    • Vars
      • R(d);CHECK,OGATE,P_SPINR(d),XS(B)::QAB1(A),XR(d)
      • K(f);N_PINS(B),S_FLIGHT::S(B),XR(a)
      • K(f);S_FLIGHT::S(F)
      • K(f);S_FLIGHT::B(E)+S(F),DCHECK
      • S(b);N_PINS(B),SBLOCK::QAB(A)+S(B)
      • P(h);SBLOCK::R(G)+S(F),DCHECK
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