MESON Chess Problem Database

Problem Display
PID: 205596 (5K2/1Q1p4/1P1nk3/1r3pP1/2R1PB2/1N1r4/B7/8 w - - 0 1)

Lubton, Yehuda

The Problemist, 1984

5K2/1Q1p4/1P1nk3/1r3pP1/2R1PB2/1N1r4/B7/8

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Sd4#
    • 1...Re3
      • 2.Sd4#
    • 1...Rf3
      • 2.Sd4#
    • 1...Rg3
      • 2.Sd4#
    • 1...Rh3
      • 2.Sd4#
    • 1...Rd4
      • 2.Sxd4#
    • 1...Rb4
      • 2.Sc5#
    • 1...Rc5
      • 2.Sxc5#
    • 1...Rxb6
      • 2.Sc5#
  • Tries
    • 1.Rd4?
      • threat
        • 2.Sc5#
      • 1...Rdxb3
        • 2.Rxd6#
      • 1...Rbxb3
        • 2.Qd5#
      • 1...Sc4
        • 2.Qxd7#
      • 1...Rc5
        • 2.Sxc5#
      • 1...fxe4!
    • 1.Rc6?
      • threat
        • 2.Sd4#
        • 2.Sc5#
      • 1...Rdxb3
        • 2.Rxd6#
      • 1...fxe4
        • 2.Sd4#
      • 1...Rd4
        • 2.Sxd4#
        • 2.Sc5#
      • 1...Rdd5
        • 2.Sd4#
      • 1...Rc5
        • 2.Sd4#
        • 2.Sxc5#
      • 1...Rbd5
        • 2.Sc5#
      • 1...Rbxb3!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Sd4#
      • 1...Rdxb3
        • 2.Qd5#
      • 1...Rbxb3
        • 2.Re5#
      • 1...Sc4
        • 2.exf5#
      • 1...Rd4
        • 2.Sxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • R(a);N_GUARD::S(B)
    • R(a);N_GUARD::S(B),XR(a)
    • R(b);N_GUARD::S(B)
    • R(b);N_GUARD::S(B),XR(b)
    • R(b);N_GUARD,XP(G)::S(B)
  • Tries
    • Try
      • R(C);
      • Threat
        • B(A)+S(B),DCHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a),XS(B)::R1(C),XS(d)
        • R(b);N_GUARD,P_SPINR(b),XS(B)::QAB1(H)
        • S(d);::QAB1(H),XP(f)
        • R(b);::B(A)+S(B),DCHECK,XR(b)
      • Refutation
        • P(c);XP(D)
    • Try
      • R(C);P_PINS(d)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_GUARD,P_SPINR(a),XS(B)::R1(C),XS(d)
        • P(c);XP(D)::B(A)+S(B),DCHECK
        • R(a);::S(B)
        • R(b);::S(B)
      • Refutation
        • R(b);P_SPINR(b),XS(B)
  • Actual
    • R(C);
    • Threat
      • B(A)+S(B),DCHECK
    • Vars
      • R(a);N_GUARD,P_SPINR(a),XS(B)::QAB1(H)
      • R(b);N_GUARD,P_SPINR(b),XS(B)::R1(C)
      • S(d);N_GUARD::P(D),XP(c)
      • R(a);::B(A)+S(B),DCHECK,XR(a)
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