MESON Chess Problem Database

Problem Display
PID: 259445 (8/4p1K1/4B1Q1/8/N7/7n/2pN3R/k5rR w - - 0 1)

Cheylan, Yves

The Problemist, 1977

8/4p1K1/4B1Q1/8/N7/7n/2pN3R/k5rR

#2

7 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Rxc1#
    • 1...c1Q
      • 2.Sb3#
    • 1...c1B
      • 2.Sb3#
    • 1...c1R
      • 2.Sb3#
  • Tries
    • 1.Kh6?
      • threat
        • 2.Qg7#
      • 1...c1S
        • 2.Qb1#
      • 1...c1B
        • 2.Qb1#
      • 1...c1R
        • 2.Sb3#
      • 1...c1Q!
    • 1.Kh7?
      • threat
        • 2.Qg7#
      • 1...c1Q
        • 2.Sb3#
      • 1...c1S
        • 2.Qb1#
      • 1...c1B
        • 2.Sb3#
        • 2.Qb1#
      • 1...c1R
        • 2.Sb3#
      • 1...Sg5+!
    • 1.Kf8?
      • threat
        • 2.Qg7#
      • 1...c1Q
        • 2.Sb3#
      • 1...c1S
        • 2.Qb1#
      • 1...c1B
        • 2.Sb3#
        • 2.Qb1#
      • 1...c1R
        • 2.Sb3#
      • 1...Rf1+!
    • 1.Kg8?
      • threat
        • 2.Qg7#
      • 1...c1Q
        • 2.Sb3#
      • 1...c1B
        • 2.Sb3#
      • 1...c1R
        • 2.Sb3#
      • 1...c1S!
    • 1.Rxg1+?
      • 1...c1Q
        • 2.Sb3#
        • 2.Rxc1#
      • 1...c1S
        • 2.Sb3#
        • 2.Rxc1#
        • 2.Qb1#
      • 1...c1B
        • 2.Sb3#
        • 2.Rxc1#
        • 2.Qb1#
      • 1...c1R
        • 2.Sb3#
        • 2.Rxc1#
      • 1...Sxg1!
    • 1.Qxg1+?
      • 1...c1Q
        • 2.Qd4#
        • 2.Qxc1#
      • 1...c1S
        • 2.Qd4#
        • 2.Qxc1#
      • 1...c1B
        • 2.Qd4#
        • 2.Qxc1#
      • 1...c1R
        • 2.Qd4#
        • 2.Qxc1#
      • 1...Sxg1!
  • Keys
    • 1.Kh8!
      • threat
        • 2.Qg7#
      • 1...c1Q
        • 2.Sb3#
      • 1...c1S
        • 2.Qb1#
      • 1...c1B
        • 2.Sb3#
        • 2.Qb1#
      • 1...c1R
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(b);N_PINQ(F),OGATE::R(A),XR(b)
    • P(c);N_SPINR(b)::S(B)
  • Tries
    • Try
      • K(G);N_SPINQ(F),S_FLIGHT
      • Threat
        • QAB(F)
      • Vars
        • P(c);N_SPINR(b),OGATE::QAR1(F)
        • P(c);N_SPINR(b),OGATE,P_PINS(B)::QAR1(F)
        • P(c);N_SPINR(b)::S(B)
      • Refutation
        • P(c);N_SPINR(b),P_PINS(B)
    • Try
      • K(G);N_SPINQ(F),P-FLIGHT
      • Threat
        • QAB(F)
      • Vars
        • P(c);N_SPINR(b)::S(B)
        • P(c);N_SPINR(b),OGATE::QAR1(F)
      • Refutation
        • S(d);CHECK
    • Try
      • K(G);N_SPINQ(F),S_FLIGHT
      • Threat
        • QAB(F)
      • Vars
        • P(c);N_SPINR(b)::S(B)
        • P(c);N_SPINR(b),OGATE::QAR1(F)
      • Refutation
        • R(b);CHECK
    • Try
      • K(G);P-FLIGHT
      • Threat
        • QAB(F)
      • Vars
        • P(c);N_SPINR(b)::S(B)
      • Refutation
        • P(c);N_SPINR(b)
    • Try
      • R(A);CHECK,N_SPINQ(F),XR(b)
      • Refutation
        • S(d);XR(A)
    • Try
      • Q(F);CHECK,N_SPINQ(F),XR(b)
      • Refutation
        • S(d);P_SPINS(d),XQ(F)
  • Actual
    • K(G);N_SPINQ(F),S_FLIGHT
    • Threat
      • QAB(F)
    • Vars
      • P(c);N_SPINR(b)::S(B)
      • P(c);N_SPINR(b),OGATE::QAR1(F)
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